I liked DOS 1 very much since it had a nice story and a great combat system. I had to cheat to get past a few insane enemies, but otherwise a great game. DOS 2 was not as great imo, the story did not captivate me as much, but still nice turn based combat. I prefer BG3 though over DOS.
Whether I'd enjoy DOS 3 would depend on the story, but I doubt it could ever captivate me as a big game as BG3 can. I guess a game is only as good as the amount of love and resources put into it.