A Crack in Time is my favorite Ratchet, and all around much better than Tools of Destruction and Quest for Booty (though nothing tops the theme of Q4B). If I had to break things into tiers:
Tier 0 (god tier):
LittleBigPlanet 1/2
Demon's Souls
Uncharted 1-3 (yes, 1!)
Tier 1:
A Crack in Time
Killzone 2 (and I guess 3)
God of War III
Gran Turismo 5
Infamous 2
Tier 2:
Tools of Destruction/Quest for Booty
Infamous 1
Heavenly Sword
Warhawk (haven't played much Starhawk yet)
And I agree that Resistance on the whole is underwhelming. I had fond memories of R1, but I replayed it several months ago and the level design felt so archaic and unimmersive compared to other shooters from this gen. Still need to play the third one, though.
Also, Lair needs to be included in that list of new Sony IPs! ;D