Largely, that is true. WMDs were found, but they were old as hell. They appeared to be remnants of the Iran-Iraq War when we definitely knew that Saddam had chemical weapons. However, we didn't find any evidence that supported the notion that he could manufacture any new chemical, nuclear, or biological weapons.
I have always believed that Bush sent us to war because he wanted to. Not for oil, certainly not for Iraqi Freedom, or the reasons that people typically point to (I actually believe this grudge stems from when Saddam tried to have Bush Sr assassinated). I think this was somehow more basic, kind of like punching a guy when you're drunk. You don't do it because it makes sense, you do it because you want to. I think that he was looking for any reason that he could get from the word go, and after 9/11, terrorism was the hot topic. George Tenet, being the yes man that he was, said, "Boss, I think this is the reason that you've been looking for. The intel community was about 50-60% sure that this was true, which normally isn't enough to go to war over. That's a resounding, "Uh, maybe? Sure, why not..." If you are going to commit American forces, you're typically looking for, "Definitely. This intel suggests that this is 98% likely that this is the case." But like I said, Bush wanted this fight, so he didn't care about good reasons. It was good enough for him, so he jumped in very foolishly. And here we are today...
A lot of people like to suggest that there was a secret, sinister plot behind it all. I just don't buy that. I think it was a case of pure stupidity, acting on emotion instead of facts. Men are wise when the data creates the conclusion, not when a conclusion is created and the facts are selected later.