Tome of Battle was one of those supplements that was beloved by the Internet community and not by anyone I've ever gamed with. The reactions I've heard to it vary by the person:
Me, initial: Stupid anime crap.
Me, upon review: Stupid anime crap, some decent mechanics. Not a fan overall.
My friend, initial: Stupid anime crap.
My DM, upon review: Why are these things set up like spells and why do I have to learn an entirely new system of anime crap to use it?
My DM, initial: I don't know what you're talking about.
My DM, upon review: I don't want to use this, just play a fighter. Also, this is overpowered.
The rogue, initial: I don't know what you're talking about, also I'm having difficulty figuring out sneak attack, so please don't introduce me to anything more complicated than flanking.
The rogue, upon review: Just kidding, no one in the group showed her it.
The psion, initial: This is awesome!
The psion, upon review: You can shoot fire everywhere. This is awesome!