I know nothing about L4D 1 or 2 because I don't have a system capable of playing it. Though even if I did I doubt I'd get either.
Of the other three that I do have a system capable of playing Borderlands doesn't appeal to me.
This leaves R&C and Demon's Souls. That's a really hard call. Depends on what kind of gaming experience you're after: Fast pace, excellent platforming, funny and all round entertaining = Ratchet and Clank; Intense, dark, brooding, very challenging but with great sense of achievement awaiting those who persevere = Demon's Souls.
Damnit I want both! But the kids will only want 1: R&C.
I don't know which way you should jump, but either game will be great.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
