The true Baldur's Gate must consist of:
1) up to 6 members in party
2) instrumental soundtrack (like early versions have); invite Michael Hoenig please before it's too late!!!
3) good interface design (like BG1 has) You have pretty ugly interface now.
4) tactical pause fighting system only!!!
5) some items from BG1 and BG2 (gems, weapons, armour) and similar inventory sounds (that leather armour sound...)
6) good old NPCs from BG1 and BG2 (Elminster, Drizzt, Volo; some old companions like Imoen, Kivan, Tiax etc)