While I agree that humans should probably 'be the norm' to provide a baseline for the setting and give context for the other various races to be unique against...there should also be a priority in making sure at least the most basic races should be covered. That is to say, in a game with 12-15 party members, sure. Make 6-8 of them human. But BG seems to have a pretty small number of party members compared to the prior entries. 'mostly humans' doesn't really cut it as well (and shadowheart & asterion's elvenness isn't really a big part of their culture or personality anyways, so what's the point)
We need more party members period is what we need. No more humans though, please. Gimmie both flavors of drow, a dwarf, a gnome, a halfling. maybe a half orc or another elf, then we can look at humans again for options. And if we do, for the love of Ao, not another Baldurian. The Realms is huge, gimmie someone from Amn or Cormyr or Mulhorand or *anywhere* other than Baldur's Gate.