Rachet and Clank 3: Up Your Arsenal was the best. I haven't played the newer ones for the PS3 though.
Deadlock was... ok. The only thing I liked about it was that you can do co-op, and it had a lot of skill points (more things to do). Besides those 2 reasons I didn't like it. It took away the "adventure" feel in the game because you're basically in a prison, couldn't use Clank, it didn't have a lot of weapons (Rachet and Clank 3 had 20 weps, Deadlock had 10), and it was short.