Best open world games for 360?

You've already played the best, Oblivion, Mass Effect 1/2. Mercenaries 2 is also very good its 2 or 3 years old but still good. L.A. Noire is really fun, you get to be a cop and solve big murder mysteries but also get to do smaller crimes like robberies, assault, high speed chases, it's a lot of fun. The best thing I think you can do now is wait for Mass Effect 3 and Skyrim on 11.11.11.