That must be it. Power Creep. How astute of you. Which is obviously why common consensus is that the Wizard, Cleric and Druid- using only core rules- are still the most powerful things in the game. Also, full caster classes, of which ToB has none, are also the most powerful. I'm pretty sure that ToB = Power Creep is incorrect. This is one of the most ridiculous consistent answers to things on message boards. Something new comes out and adds some power where there was little before and it magically becomes "Power Creep". After looking at some monsters, and the fact that "monsters" can have class levels, the game isn't really all that different now than it was a few years ago, but I think that it's at least more fun now.
Some ToB stuff is a little tricky for people to understand. The Sage stated last week that this would be the week of ToB questions. People still question core things sometimes, so questions aren't that crazy.
The Duskblade, Abjurant Champion, Warblade and Warlock are NOT overpowered. They're fine.