I hate to be a downer, but I'd say the larger question is, is there a benefit to being a warrior at all right now? The answer I keep coming to is no. It would be one thing if warrior was just challenging to play and thus only a liability to the group if you were a bad or even average player.

That isn't the case. Warrior is a liability, even if you're an amazing player with the best gear the game can offer. Thus after spending all my money on a relic item I won't ever use, and gearing out my warrior, I am now leaving it on the back burner to level something my FC can actually use in a group.

Without any good group utility (except to increase your paladin MT's damage by 10%), no good damage to speak of (your dps is negligibly better than a paladin's anyways), and terrible survivability as a tank, sadly there is no reason to play this class, except if you really really really want to for some reason.