But the combat system was garbage.
You just fight hordes of humans or darkspaws that act like humans over and over, there was no strategy, no sense of progression whatsoever (since you could get the strongest spells like 4 levels in) no rare encounters... how they went from BG2 exceptional encounter design to this, i really don't know.
See, I really don't get where this is coming from. Even just playing the game on normal there were fights that could kill you in seconds if you didn't set things up correctly, especially if you play on a difficulty with friendly fire where you have to pay attention to your characters positions as well. Of course it could be improved in a lot of ways, but that's the whole potential of sequels, they can improve things from the previous games. (not that they bothered to do much with DA2, felt exactly the same but faster, wave based, and the mages weren't as good)
I can understand the progression issue since you very quickly run out of skills for warriors if you want to focus on one weapon. But for the Mage the progression comes from unlocking a huge selection of skills
And there are tons of enemies you fight in DA:O. Yes, the Darkspawn and Humans make up a lot of them, but they're the main enemies in the game, or course you'll fight a lot of them. You also fight spiders, dogs, big brute darkspawn guys, magical darkspawn/evil mages, whole bunch of magical/veil monsters, dragons, werewolves, golems, and then the bosses on top of that. True they could have used some rare encounters could have been cool
And it's pretty obvious how they got from BG2 to here, it's been a decade since that game came out. Given the rate of turnaround on employees in the video game industry you'll be lucky if a fraction of the people working at Bioware are the same that were working there 12 years ago.