Speaking for myself....
Uncharted, Valkyria Chronicles, Fallout, and Oblivion are must haves. All are top quality productions with fantastic stories, graphic's, control, and music.
Metal Gear... is very good, but if you don't like looooooooong and frequent cut scenes, you might want to rent.
Ratchet & Clank.... great platforming fun, fun, fun
Resistance I & II... had a blast playing both games and both are top quality. But I only played solo mode as I'm frag fodder online in most games of this type.
You can expand the gameplay and enjoyment hours of Valkyria, Fallout, and Obilivion with some excellent DLC for each.
Other early PS3 releases I would suggest are Civilization, Godfather (enjoyed it much more than GTA), and Folklore (sort of an RPG but maybe not a true RPG)
Mendon
Edited by Mendon, Mon Jan 25, 2010 6:51 AM.