I may get a new PS3...

[Neerb]

I may be getting a PS3 soon, so to those who already have one, what game should I get?  That is, if I can only get one PS3 game at first, which should I buy?  My tastes for genres are generally broad, and it's not like I have a dedicated following on any PS3 series, so just say what you personally think would be best.

[Friendly Hostile]

Unfortunately, I have to say the 360 Oblivion is far better simply due to all the extra content available to it.

[The Riddler]

Metal Gear Solid 4 is a no-brainer.
Both Uncharted games are great too.

[Custom]

 Uncharted 2.