Oh well, sounds like you've got the mechanics down well enough. That is one of the hardest fights in the game you're describing, at the end of the Mage Circle scenario. The Mage Circle also has that tedious Sloth Demon sequence where you have to keep shape-shifting and solve puzzles by matching your form to the room, and you don't have access to your normal skills. I thought that would never end, and I modded it out for all my other runs. (Yes, one of the most popular mods is "Skip the Fade".)
I do remember that I enjoyed the combat at first, but I started to find it tedious as the game went on. I also remember mostly micromanaging the combat with very little reliance on the AI tactics, but I was used to that from Baldur's Gate. As you probably know, if you play BG or any of the Infinity Engine games as minimal or no reload, using the AI is going to get you killed.
I think any AI, no matter how well-programmed, is never going to work as well as a human brain for tactics, because a person can deal with unique emergent situations spontaneously, and an AI can't, or at least it couldn't when BG and DA:O were developed.
There's no need to force yourself to play a game you're not enjoying, despite peer pressure to the contrary. I'm sad you don't seem to like it as much as I did, but you've given the game a fair chance to bring you pleasure in your leisure time, and if it's not doing that, you're right to play something else, because games are for pleasure, and they shouldn't feel like doing chores.
As I said, I was tempted to start a run of my own so we could compare notes, but I've been trying to finish a Jedi Consular class story in Star Wars: The Old Republic, and it's content I've never seen. I know from my history that if I let myself get distracted from this game to another game, I'm highly unlikely to ever come back to the same character and finish the game I was on, so for now I'm planning to stick to it, because I am having fun with it.
You've still inspired me to give DA:O another go once I'm done with my Star Wars game, but I guess the timing isn't right for us to be playing DA:O at the same time.