Mine would be

1.R&C up your arsnal

2.R&C going commando

3.R&C tools of destruction

4.R&C quest for booty

rest I havn't played them yet...

i have played all of them , i don't know about my favourite but my least favourite is deadlocked. it felt like a spin off, and just an arena game.

Hmmm...

Ratchet & Clank: Going Commando
Ratchet & Clank: Up Your Arsenal
Ratchet & Clank Future: Tools of Destruction
Ratchet & Clank
Ratchet & Clank Future: Quest for Booty
Ratchet: Deadlocked
Ratchet & Clank: Size Matters

Unfortunately, I won't be able to play ACIT for a month and a half at least...
Also, I'd like to point out that I LOVE Size Matters, so that should say wonders about the rest of the games. I'm not counting Secret Agent Clank since it's more of a spinoff (and I didn't like it as much as Deadlocked, which is also kind of a spinoff).

Ratchet and Clank: Up Your Arsenal
Ratchet and Clank: Going Commando
Ratchet and Clank
Ratchet Deadlocked
Ratchet and Clank Future: Tools of Destruction
Ratchet and Clank Future: Quest for Booty
Secret Agent Clank
Ratchet and Clank: Size Matters

Didn't how many there were. Insominac needs to slow things down and High Impact Games NEEDS TO BE REMOVED FROM THE LIST OF JAK AND DAXTER DEVELOPMENT TEAMS.

I haven't played the original or Going Commando (or ACiT, obviously).

1) Up Your Arsenal
2) Tools of Destruction
3) Quest for Booty
4) Deadlocked
5) Size Matters

Tools of Destruction
Quest for Booty
Size Matters