Played for about 90 minutes this morning and finished the intro and first planet. This game isn't "half the price, half the length, half the effort". This game is a legit Ratchet and Clank installment. If I didn't know about the length, I would've thought the game was business as always. The Netherworld puzzles are great too, like a faster paced Limbo where you don't die in one hit. Not as tricky as the puzzles in ACIT (maybe they'll ramp up eventually) but still fun. Still funny too. Oh I missed these games.
And to confirm what I said before, you can safely jump to this game without playing All 4 One and Full Frontal Assault. So far not even any mention of Qwark being Galactic President. The Future trilogy is all you'll need. However, the game's controls are very different from the original and Future trilogy, using the Full Frontal Assault control and aiming method (which pretty much means you'll have to aim and strafe as opposed to letting the game target for you). By no means terrible, but it takes some getting used to (I played UYA recently).