Past 40, as a tanky DPSer Shadow, I started to find some of the boss fights nearly impossible, attempting them at-level or with me one level too low.... until I started switching up the companions to suit the situation. Qyzen has been my favorite all the way through, and has been best for me for most fights, since between my taunts and his tank stance, I can usually ping-pong the aggro back and forth and make use of both of our health pools, and his DPS isn't terrible for a straight tank.
But some of these boss fights are needing a bit more, and my interrupts aren't always enough. With Tharan, even without him being geared up as well, these fights got a lot easier, since the healing is the one part I can't do myself. It made ALL THE DIFFERENCE when I fought Stark (class quest right after Belsavis, roughly around level 43). It went from impossible to almost feeling like I was cheating.
Just a tip with him, it's all about breaking line of sight on his attacks, and interrupting his heals.
I haven't seen so much of a problem with the ability delay, but I've seen the forum threads. I'm wondering if this affects sages more. Maybe I'm just spending too much time watching my cooldowns instead of the animation to notice the problem?
The hi-res thing doesn't bother me so much, in that they can just patch that at some point. I've seen other games limit it at launch and then put out a patch a few weeks later to unlock it. Not sure why that happens.
Agreed on the GTN. It's horrific. Half the features don't work, and it's very limited with what does work. Hopefully they'll fix that up before long.
But yeah, I'm loving the stories, and the cinematics. I'm just starting to experiment with the PVP warzones. Just did one last night to get my feet wet. I scored right in the middle for the overall rankings for the mission, which isn't too bad for a first try. And our team won, which is nice.