For the record, I'm the GM of a Warblade that's been playing it for about half a year now. I went into it very reluctantly. I don't like the Warblade. I felt the class was overpowered. I don't like the mechanics of the Warblade. (If it's magical--and face it, the maneuvers are--then it's NOT a pure tank class, dammit! Don't call it one!) I let the player give it a try because I could have been wrong, he really wanted to play it, and we have a solid GM/Player relationship based on some trust. If it didn't work out, I knew we'd be able to work out an acceptable compromise.
I have this image of myself over the past five months or so, crouched over the PC like a cat over a mousehole, waiting for the moment when I can pounce and say "SEE?!? Clearly overpowered!!!!"
I'm still waiting.
I'm still not entirely convinced the Warblade is a balanced class. I still don't like the mechanics of it. But I *have* decided it's not extremely overpowered; if I do finally decide it needs fixing, I'll likely change some of the class features rather than ban it outright. For example, I have already removed the "free action recharge" entirely, since the maneuvers renew each combat anyways. (The player had never even used the ability before then.)
YMMV, but I went into this *expecting* the Warblade to prove obviously overpowered. Almost *wanting* it to be (everyone wants to be proven right, after all : ). It hasn't happened.
(As an aside, the other PCs are a Duskblade, Beguiler, spellcasting-centric Cleric, and Artificer. So that may have skewed the results. Take that however you wish...)