McGonagall isn't silly, but she is the weakest Order-of-the-Phoenix character we've seen by far. She's always too stupid to understand what the wizards are talking about. She, much more than Hermoine, is a female character that is not strong enough.

It would be interesting to see more of Bones. She has certainly shown herself pretty bright and likable, and we haven't seen her priorities and tastes be as questionable as the other competent characters (Dumbledore, Snape, Quirrell, Moody).