As far as I can see, your argument is based on unoptimized play, because I can paint a different picture.One thing I've noticed is that clever self and party buffing can definitely make these feats better, but I don't think they're better than intended. The raging GWM barbarian swings with advantage and when he hits, it deals damage like a fireball....but then, only to one target, and it costs a daily use of Rage to get that advantage (and I'm not sure he'd risk it without rage). The sharpshooter has advantage far less often, but when she hits the damage is comparable (a bit less, but she's ranged, so she's gaining defensive ability to do that)....and she's missing a lot more.
5e's mild preference for many critters in a fight and for many fights/day helps bring that curve down to a respectable level. If every attack you make is at advantage (or at +1d4 from a bless or something) in a day, maybe it could seem OP, like a single-target at-will fireball. But, these things are not always easy to come by. And, as I'm sure my party ranger can attest, missing is a real negative pressure. Heck, last session, another party member was like "Maybe don't use Sharpshooter for a round? Because you are having a lot of whiffs?"
I've noticed something about your math; I can't seem to duplicate it when making what seemed based on your data provided to be the same assumptions.Important clarifications:
- GWF, or Great Weapon Fighting, is the fighting style. GWM, or Great Weapon Master, is the feat. It's important to keep these two acronyms separate.
- Spellcasting power is at best tertiary to this discussion. There is a caster/martial divide, though it is much smaller in 5e. However this topic is talking about the power that this feat gives some martial characters. That inceased power isn't really relevant to the topic of the caster/martial divide and to use this feat as a "fix" to that divide is incredibly problematic as it does nothing for many martial builds. At best this strategy would further weaken classes like Monk, Rogue, Ranger, or TWF.
Ok, so with those things out of the way lets consider the actual math:
http://i.*****.com/CKyQkj5.png
Math provided on google spreadsheet: DPR of Classes
So for a 5th level barbarian any AC up to AC 18 the Barbarian is better off having taken GWM and using -5/+10. Assuming a barbarian fights an equal distribution of enemies from CR 2 to CR 8 from every officially published WotC book the average enemy's AC will be 14.4. This aligns closely with the DMG's recommendation of 15 AC for a CR 5 enemy. So the AC of an enemy would have to be much higher than average to have a negative impact on this choice.
Using that 14.4 a 5th level GWM Barbarian is averaging 36.7 DPR while a 5th level Barbarian who took 1 strength instead is doing 23.3 DPR. The difference is massive: 57% more damage.
Sure there are cases where a barbarian isn't going to want to use -5/+10, but as you can see in the graph above the Barbarian is still better off taking GWM and not using -5/+10 than taking +1 str.
Let me make that part clear: The cleave part of GWM is better than +1 strength modifier in terms of damage.
So even if we ignore -5/+10, GWM is an incredibly powerful feat. Add in -5/+10 and it's definitely out of the expected range for damage - especially for classes with easy access to advantage like Barbarian, OoV Paladin, Fighter (BM w/ trip).
Does it make martial classes equivalent to casters in versatility? No.
Does it make certain martial classes do far more damage than expected compared to their martial counterparts? Yes.
It's overpowered.
I don't find that to be true. If we ignore that a feature only applies in certain situations and analyze that feature as if it were universally applicable, how could we possibly feel our assessment is fully accurate?The fact the feats are poor past the AC cutoff point is wholly irrelevant.
I've got high-level characters at my table, and they are played by experienced players, and yet this thing you insist will happen has not.Please accept as fact that this will happen at your table too once your players level up (and their characters too).
Now I'm not following you, Aaron.I don't find that to be true. If we ignore that a feature only applies in certain situations and analyze that feature as if it were universally applicable, how could we possibly feel our assessment is fully accurate?
In fact, I think this might be the core point explaining how some people arrive at the conclusion that these feats are "over powered"; by considering that they always apply. Even if that is true in a particular campaign, it is not the feat, but the campaign, which has created the issue - and a feat not working for a particular campaign doesn't mean that feat doesn't work at all.
Excuse my misunderstanding, as it did seem the only possibility given that you were saying the rest of us aren't supposed to point out when the feat isn't a viable damage boost.Nobody is considering they always apply. Nobody is analyzing the feat as "universally applicable". At least not I.
I see where the confusion seems to lie.What I was talking about is the tendency to excuse the feat because of all the times where it is used erroneously; that is when you elect to apply the -5+10 even when the AC is too high.
Including that does indeed lower the dpr boost... but doing so is also a mistake.
Ah, okay. Yes of course you should calculate the dpr against, say, AC 25.Excuse my misunderstanding, as it did seem the only possibility given that you were saying the rest of us aren't supposed to point out when the feat isn't a viable damage boost.
I see where the confusion seems to lie.
When comparing the DPR of the -5/+10 boost vs. +2 strength, it is clear and unquestioned that the times when the -5/+10 option isn't used that the +2 strength has superior DPR, since it is both more accurate and more damaging.
So that means that all we need to know is A) how much the use of the -5/+10 actually improves DPR in those occassions that it is an improvement, and B) how many situations in which the use of the -5/+10 improves damage vs. how many it doesn't.
That is why the comparisons are done in the way they are, assuming use of the -5/+10 even though it might not be enhancing DPR against that particular AC, because the result then tells us either that this is a situation where there is a boost and how much that boost is, or that this is a situation where the feat is not providing a damage boost.
So no, it isn't a mistake to do the comparisons that way - though there can be a mistake made in assuming how frequently a particular AC is or isn't going to come up in a campaign, since that assumption might match one campaign, but not another.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.