Coming over from TOR, it isn't just a long global which is the problem.

I've just finished leveling a paladin, my first role, to 50. However, I don't really feel that driven to play it at endgame. I started on the relic reborn quest last night and read up on the boss fights earlier. It would appear that for the endgame bosses, my job is quite often to stand there and use my stun every now and again. I can use oGCD abilities, but if I miss a stun we're stuffed. I contrast this with TOR when I'm managing 2 stacks of defensive buff together with a stack of offensive, plus cool downs, plus movement and tank swap mechanics and the odd add with a global cool down a second less than FF and it's easy to see why tanking is a bit plain.

I think it might have been a conscious decision on the part of the developers to make rotations fairly simple and the GCD long due to consoles (I'd agree that a rotation with lots of abilities won't be easy on a controller compared to a keyboard and mouse), but that shouldn't stop them adding more interesting mechanics to the fights.

What you say about effects also rings true. As a paladin I have a few, but the only one which really seems to be used is stun. Everything else is fairly moot due to the gradual/instant resistance to it.