If you don't know much about Chesapeake Energy Center, 322 is a pretty safe bet. It's on the same side of the court as the team sidelines and has a great view of the HD jumbo screens at upper center court. You can see the fast breaks really well and when there are actually plays ran, you can see them form very well. The casual basketball fan would probably hate 322 because it's not close to the court and requires some exercise in order to reach your seats.
But what you get is a great view from here and most of the time, that's all you need. Watching a Thunder game at home on t.v. is a completely different experience than watching it live at the arena. If you live in the OKC metro area, it's one attraction that you have to take in at least once.