At the moment, anyone who takes a 2H weapon fighter over a 1H weapon fighter as the sole defender in the group, is doing the group a disservice. The tiny amount of extra damage he dishes out is off-set by the resources he's going to eat up being kept up because of his lower AC and Reflex defences.
Whereas this 2W fighter variant is quite well balanced. You get a good benefit for what you're losing. I wouldn't begrudge a player who chose this as the party's sole defender. I would, however, be miffed if they chose a 2H fighter.
So, it seems you are saying that if someone who
wants to play, for example, a Greataxe Fighter and they were in the same group as you, you would just be "miffed" at them the whole time for not being optimized for the way you envision groups?
I believe that if someone with whom I am playing with wants to play a Great Weapon Fighter, they are more than welcome to! If someone wants to play a non-optimized character for their own reasons, be they roleplay or otherwise, I would encourage it, not consider it "a disservice" to the group. This is a game that we gather to play and enjoy ourselves, with the freedom to be as creative as possible. We are given the tools to create entire worlds, for heaven's sake! It should
not be a game where we have to worry that we must conform to the beat of someone else's drum at the table. Especially for such mundane reasons like another person's notion of "optimization," or worse, having someone "miffed" at us.
Naturally, there is a limit to how far 'nonoptimization' should go, but it is easy enough to distinguish between a$$hattery and a genuine reason.
Now, imagine that you have a son who wants to play a halfling fighter who runs around with just a dagger and no shield. He wants to because he has watched a lot of the Lord of the Rings (probably because of you) and loves the hero Frodo. Your son thinks Frodo is a fighter, not a rogue, no matter what you say to him. Would you explain to him, "No Son, halfling fighters suck. Their small size means they won't be able to move around anything bigger than a medium sized creature. Plus, you are running around with just a dagger? That is such a waste of your build! You must play with a shield. I mean, everyone knows, a shield and weapon fighter is the only real fighter in this game. Anything else is just a disservice to the group. You don't want to be a disservice to the group, do you, Son?"
Most people would not say this to their own son. I know I wouldn't. To do so would just, for all intents and purposes, effectively crush his imagination; we have now imposed artificial walls in his mind. Instead of teaching our son to be creative, we have taught him that there are limitations to that creativity. I feel that we should let him live out his fantasy in the way that he sees it, and thereby stretch the limits of that imagination and creativity.
So with this in mind, why would you
ever say this to someone else who is using their free time to come and play D&D with you? If it is wrong to impose artificial walls upon the minds our progeny, surely other people should be afforded the same right.
Short version: Greatweapon Fighter is a build in the PHB too.
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As for this fighter build, I think it's great. A viable build for Fighters who have always wanted to dual wield and wear light armor; which it seems there is considerable interest already. Fantastic!
And now, maybe those damn light blade/high dex fighter powers will actually see the light of day. (Armor-Piercing Thrust or Rain of Blows for example.)