This is one of those games that "if you could have one game on your system, which would it be."...erm...would be.
I like most of what I've seen...I really enjoyed the Ratchet and Clank games and I know how much Insomniac makes you want to keep playing.
That beings said...it's probably not going to make me buy a system for one. In all honesty, I don't feel I can justify the time for two consoles.