Let's see here. . .
I've only seen this complaint thrown around a couple of times. I'm relatively new to the forums, though, so I can't really evaluate if people consider it a big deal or not.
I don't really care for the fact that a character's BAB is tied in with their HD. I understand that it provides internal consistency within each type of class, but there are instances in which this doesn't give a class enough to hit *COUGHMONKCOUGH*, and others in which it seems to be an unnecessary boon.
Ultimately, though, it's mostly a gripe against the monk.
Which I'm not going to bother getting into because this isn't one of the five oceans I should be spitting in on this matter.