In my opinion BG1 is not overrated but rather still underrated, because it has "full" party size unlike
newer games (like the other above mentioned) and did many things the right way "first".
I still like Bioware pretty much even though they are getting corrupted by the dark side of the game industry.
DA2 was quite good, if a bit linear and short and ME3 is more of a Shooter than anything else (in my opinion) - wich doesn't make it a bad game.
I can't say much about KOTOR, but I think that it is one step backwards from the ingenious titles of BG1 and BG2 and of course Planescape Torment.
(Icewinddale had a good feel to it too, but the PCs were too lifeless for an imersive game)