I'll preface this by saying I am a PS3 owner and have only sporadically played Xbox 360. I'll also add I'm not really a fanboy - I'd have an Xbox 360 if it weren't for the lack of time!
But to me, the PS3 is one of the best all around gaming consoles going around. Reasons:
* By now, the have an excellent catalogue of games, including: Metal Gear Solid 4: Guns Of The Patriots, GTA IV, Killzone 2, Batman: Arkham Asylum, Grand Turismo series, Borderlands, the Call Of Duty series, etc. (I realise some are not PS3 exlcusive)
* It is powerful as hell and the true capabilities are still being explored; I thought GTA IV had mad graphics and they're telling people they only really used like 50% of the machine's abilities
* The online system (I'm not an online gamer tbh) is easy. I've heard Xbox is better though.
* Wireless controllers (Not a console exclusive but a massive plus)
* Blu Ray player
* Storage for audio, video, photos, etc.
It's more than a console to me - it's a multimedia solution.
But like I said - I'm not against the Xbox. It's a fine machine.