I have been a huge ratchet and clank fan since it came out on PS2. But to tell you the truth it really needs a reboot more so then a new title. I just feel right now that the franchise has real worn out its welcome and hasn't delivered anything new or interesting for a while now. When they moved to PS3 I wanted more then better graphics.
I will rent this one, but I will go into it with tamed expectations and an open mind. I'm in the camp of unless you got something new and compelling to show me, put that franchise away long enough for me to miss it before releasing a new game.