Crackdown 2 is fun. It's not up to par with red dead, but def worth it. imo.
Compare contrast it with Fallout3 and Oblivion type games.
Uhmm.
Nothing like them. It's kind of like Red Dead, in a way, where it's not that linear, you can kind of do what you want. It's a "sandbox" type game, a large area you can roam around do what you want.
If you don't feel like laying down 50-60 for it, pick up the first one for 10-15 bucks used anywhere and see if you like it. They aren't too different.