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Have a game with Multiplayer, an online connection and be signed into PlayStation network is a good start
MAG is an online game with only a multiplayer mode see related link
No you can't play multiplayer offline only single player. But you can play it online with other online players.
My opinion of the best game for PS3 is LittleBigPlanet. Because you are able to be creative and make whatever you want to make. You can even make your own character to play with. One thing I promise you with littlebigplanet is that Everything your fantasy says, you can make it here. Plus its great multiplayer up to 4 people online or offline and you can make levels multiplayer online or offline too. -Yazzosykingen (PSN) i agree
Yes, warhawk on PS3 is an online multiplayer only game. Originally, there was supposed to be a simple player campaign, but it was cut out of the game's final release The predecessor to warhawk, know as starhawk will feature a single player campaign as well as online multiplayer.