You don't understand what the situation was. The Texans wanted to trade down and tried repeatedly. The largest fan base last offseason for the Texans also wanted a trade down. I wanted it REALLY BAD. They tried and tried to do that. The offers were rediculous. They tried to get somebody to offer what that pick was worth, and tried some more. Finally, the last team in a position to want it enough to offer enough (Jets) refused to even talk anymore. The trade possiblity was over.
Now, moving on to the actual draft, I DID NOT want to take Williams #1 overall. I agree with you there. He's a good player and he'll be great (relatively speaking), but he wasn't worth passing VY and RB, not to mention Leinart. I still have some remaining doubts (however small) about Bush--he's the greatest slot receiver EVER (by a long distance), but, well, you see the running back numbers. It depends on how you look at it with him. I've defended Carr many times (although I won't bother anymore), but they were stupid for giving Carr that extension, especially when they had VY begging them to come to Houston.
Mostly, I wish that trade down could've happened, but it just wasn't there.