I recently bought a PS3.
Right now, I use it mostly for Blu-Ray and as a media center because my focus has been on the 360 and the handful of "must have" games out there right now like Mass Effect and such.
That being said, I do own Ratchet and Clank and it is friggin' fantastic. I picked up a second hand copy of Resistance after seeing Las flog it death in several threads
and I have to say, he's absolutely right. Drake looks beautiful and based on the demo it's up near the top of my 'games to get' list.
If you have the cash or can get a good deal on one, I'd say sure pick one up.