LoL @ character power rankings. You could not force me to take Aerie, Jaheira or Anomen into my party even if they were shapeshifted dragons and destroyed every enemy instantly with their fiery breaths.
On the other hand, Cernd is a bro, even if his usefulness around ToB is... disputable (switched him for Sarevok, to be honest, who is a bro in a more literal sense and fitted my evil party much more), Mazzy is awesome (I have thing for pint-sized fighters, gender aside), Viconia is a magnificent bitch, Jan is funny (or at least was when I was younger, his turnip humor might not have aged well alongside me), Korgan is the man and Edwin is just the right sort of arrogant and annoying prick. I also like Haer'Dalis (because bards are cool, and fuck the haters).
Minmaxing is fine in its own way, but I will always prefer playing to the party's strengths and around its weaknesses, because that makes for a much more fun game.
EDIT:
The IE noob that I am, I am of course also curious about that no-level-up playthrough. Definitely would read.