In my opinion, the best thing about BG3 is the engine. I think they did a great job of the character animations, graphics and how it interlaces with cut-scenes. That you can have an isometric tactical game flow so naturally into RPG is really impressive and for that alone I think BG3 is special.
Having said that, I actually dislike a lot of the other choices they made, including the way they handle combat rules. I quite like 5th edition D&D, but I dislike the liberties they take including surfaces, barrels, jumping etc. (Though to be fair it is much better than in the EA.) I also disliked their narrative, disliked the companions, and disliked Tav's lack of personality.
So, on balance, I would love to see this engine used to remake games that were mechanically or narratively better, but I wouldn't want Larian to do it. The Pathfinder games, for example, are much better games, mechanically and narratively, but have much poorer graphics and engine.
