In the battle between 3.0/3.5 and 5.0, as an old timer I'll pick 2.0 every time. However, I already had my satisfaction from BG1 and 2. 5.0 is the current Soup De Jour, and I would have no right to insist the gamer world accede to my preferences.
That being said, I can certainly manage to play and enjoy a BG 3 built around 5.0
Suggestions on implementation variances to make 5.0 work in a computer game vs real life DM situation are always welcome...griping about a D&D game based on the current version of D & D mechanics is just durn silly.