In MW2 What is better, RPD, Scar H or UMP 45 or MP5K?

Depends on your taste. A lot of people like the scar and the ump. I personally am a fan of the mpk5 and the acr. If you are on the 360 add me (LHR Pink Star) and you should join my gaming community! We are 2100 strong, for mature gamers, and we are not only a great group of people but we also have a proteam! And we have company and platoon battles where you can win microsoft points and xbox live memberships. It's legit. Check us out at LHRgaming.com