Was any other President critized for not going to bid for a US city in the Olympics? No? Then why would you suggest that this would be said of Obama? The only reason that it is being talked about now is because he did go. I doubt very seriously that it would have even been brought up otherwise.
In my mind Obama going was plain stupid. He has far more on his plate to be dealing with than a chance for some stupid games to come to the US. Like the economy, health care, job rates, illegal immigration, crime rates in the US, Afghanistan, Iraq, N. Korea, Israel, Iran, space program (IMO the space program is very important for the future of humans), education, and no doubt other things which just don't pop up in ones head like the above did with me.
Were all these things talked about in detail on that 20 hr flight or the hours spent at the meeting? If so fine, I won't begrudge him going. But I seriously doubt that all of them were...especially while sitting at a desk talking about why he thinks Chicago should be picked and listening to others voice why they want their city picked.