Alot of the combat in the game has felt that way, but not the bigger fights. I just fought the six-tits demon in the Deep Roads, and that might just have been the hardest fight I've seen. It wouldn't leave my casters alone.
I think my game is sort of bugged though. I installed the addons after I'd started a save, that might have to do with it: The "free items" show up in my inventory, but I don't get the map markers for places like Warden's Keep and wherever the Golem is, even though I talked to the quest givers. I guess I'll start over later on, and see if that helps.