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[NuclearDem]

1. Well, there are a few great open world games for PS3.

Skyrim obviously is one of the best. Fallout 3 is another (made by the same developers as Skyrim).

The Saboteur is okay, but I just generally felt lacking while playing it. It took a bunch of features from other open world games (like Assassin's Creed) and generally just didn't do them as well. Also the voice acting is atrocious. Thickest accents ever.

While it's not necessarily "open world" like Skyrim, I would greatly recommend the Mass Effect trilogy. Plenty of exploration available, good RPG elements, and terrific story and voice acting.

As far as time commitment, none of these are MMOs, but you'll definitely be putting substantial time into them, just by nature of their being expansive open world games. Skyrim, Fallout, and Mass Effect especially.