Haven't noticed many of the issues mentioned here. Yes, the AI sometimes "hangs" and it takes some time for the game to progress then, but that's about 10seconds or so and it's rather rare. Don't notice any weirdness with post-spell pausings people mention too... hmmm...
Well, it all adds up. Sometimes the enemies hang, but as you say, very rarely. Using skills/spells usually takes many seconds. Every skill has a ridiculously grand and long animation. "I'm making a cup of coffee here. HWAAHRARAshuuu!" Some enemies pause for multiple seconds between attacks, like the ghouls near the church in Cyseal. I have to wait until my ranger has finished her reloading animation to move on or shoot again, which takes many seconds.
I don't personally care. I don't think the combats are too slow. But there's a lot of needless slowdown in my opinion. The only thing that annoys me are the spell and skill effects... Did they really have to be so grandiose?