I’ve now beaten all four of them. It's been very interesting to go from one right into the next and not lose track of the narrative that connects all of them.  All of them that is except Deadlocked.  While it's a fun game on its own, it lacks many of the connections both thematically and mechanically that the previous three
shared. Now I'm not saying I don't like the game, because I do, it’s just
that when you go through them all in one continuous string, there is a distinct
difference in the way Deadlocked played than the other three.

The appealing elements of the first three included their humor and the crazy weaponry “unfit for this world."  I felt like the first three didn’t focus as much on the weapons as they could have, the first most of all. Deadlocked certainly didn’t have that issue but it lost the humor that bound all the others together.

I saw screen shot of the next Ratchet & Clank game for the PS3 and from the looks of it, it would appear that they are returning to their platforming roots.  I’m looking forward to that.