That's simply not how 5E works.
It's a team game, of course it is how it works!
There's no such thing as a character who "has skills" instead of being good at combat in 5E. This isn't 1/2/3E.
I completely disagree.
And the only actually example you've given is a character who appears to be mediocre or bad at pretty much everything, and anti-optimized.
What are you talking about? What example? How are the mediocre or bad, etc.?
Because I've seen the subclass in play with players who are clearly much more interested in optimizing than the ones you're describing, and whilst it's good, it's not "night and day" compared to other Fighter subclasses. I'd say it's top three personally, but a lot of people would rate it lower.
All I can tell you then is obviously experiences differ. I rate it as probably the second most OP subclass for fighter, with Echo Knight likely taking the top prize (like I would
ever allow one of those...).
Hell, on the top optimization site, it doesn't even make 4/4 stars.
Character optimization guide for the DnD 5e Fighter's subclasses.
rpgbot.net
Oh please, this is one thing and their interpretation. Besides, what the heck with the annoying color-coded rating system? Just use stars or grades or something people more often know at a glance instead of trying to decode the system to understand the rating.
I mean, come on, the rate the Cavalier above the Rune Knight??? Not even close!
Why can't you accept that the problems you had were down the specific setup in your game? Occam's razor makes that a lot more likely than this subclass being insanely super-powerful but no-one else having experienced that.
Because it blatantly isn't true? Occam's razor makes it a lot more likely a later subclass full of bloat and power creep is likely OP compared to the ones that came before it.
Further, I've already stipulated this was also a case of "perfect storm" when you consider HAM, CON 20, Relentless Endurance, etc.
Further, you're saying the other PCs are "just as optimized", but literally everything you've said suggests that they aren't.
How is a AT/WM combo not as optimized? Max ability 20 for DEX, great damage, nearly the same AC, mobile compared to tanky, and a stealth/perception god. Even more versitile magic, ritual casting, etc.
I would LOVE to see what you consider "optimized" by comparison.
More effective than just AT? I instinctively don't believe it for one second, and you'd have to specify exactly how. More effective than other Rogue subclasses? Not most of them.
Yes, he gives up 1 die of sneak attack for attack cantrips and ritual casting and a lot wider spell selection. I would most certainly say at 8/2 he is better off than 10 AT.
I'm not comparing his choice of subclass to other rogue subclasses. My point is about the RK compared to other fighter subclasses. Everyone in our group saw how powerful it was, and yes were happy that PC was retired!
I am pretty skeptical that a Rogue/Wizard MC did better DPR (so with lower-than-expected SA), encounter-on-encounter, than a STR-maxed Fighter with a 2H weapon. I could see it being very similar, but "routinely more"? Hmmm.
His character is optimized for dealing damage either at a distance or by moving in, striking, and moving out. His melee is 1d8 (cantrip) + 5d6 (shortsword and 4d6 SA) + 5, for an average of 27 damage on a hit (ignoring critical damage), not to mention the extra 2d8 damage if the target then moves to come after him OR the additional damage to a secondary target--depending on the cantrip used.
Who said 2H-weapon? He fought with two weapons. Sorry if you misunderstood or I mispoke, but just to be clear.
And yes, routinely more. Why? Because often his ONE attack was fully utilized, while the RK might not get all his attacks in. He had two but often his third via the bonus action conflicted with his RK power, Second wind, etc. The rogue has no such issue. Also, the rogue could get sneak attacks on OA on occasion, further increasing his DPR potential.
I'm not saying the rogue did 30 and the RK 10 every round or anything like that, but the rogue definitely counted more for dealing damage than the RK. Could you make a RK with even better damage? Sure, drop his AC a point and go 2H with GWM, removing the Tough Feat. Great, now he is near-impossible to take down AND a better damage dealer... In that sense the RK wasn't even optimized--he was optimized to survive--which he did.
Frankly, as I've said, I already posted in another thread why the RK is OP compared to other fighter subclasses pre-Tasha's. Others can be strong certainly, but combining things like you can do with Runes is sick, absolutely sick. The easiest fix is to remove the "In addition" second paragraph from each Rune. You'd have a strong subclass still, but not OP then IMO.
Not multiclassing would be a better MC mix. That's literally anti-optimizing, which is why I call it that. It's fine to do that, but we can't pretend that's "optimized".
Huh? What? Are you kidding me? Why do you think there are so many people who hate MC dips??? MCing for a level or two often produces much more optimized PCs than going straight class.
And yet your complaint is he died all the time? Seems like it didn't help much!
No, I said he went down more. And along with the other PCs it was common for one of them to drop in most encounters while the RK was still at half HP or better.
The only encounter the RK was pretty much screwed in was a battle against a spellcaster. There the rogue's evasion was worth more than the higher HP the RK had.
At any rate, we won't ever see eye-to-eye on this. Do your OWN comparison of the pre-Tasha's fighter subclasses to Rune Knight and then come back to me if you want to discuss it further. Prove to me I'm wrong, that other subclasses offer as much, allow as much capabilities for as long, etc. because once I saw this happening, I did to my own comparison and decided, "RK? Never again (without serious nerfing)."