Your worst enemy though, will be the game's camera. While most of the time it does a good job focusing on the action, it simply just doesn't zoom out far enough to give everyone a good view of the area. Given how crazy and chaotic things can get with four players and a dozen enemies on screen all trying to laser each other to pieces, it can get dizzying trying to keeping track of what's going on or who needs help. There are several parts throughout the game where you and your team will be split up by the environment, either by just taking turns making a jump over a hazard or just by being knocked around by enemies. The camera, on the other hand, won't back up far enough to show the entire scene and players will sadly end up confused and off-screen until they can regroup. Also, God help you if you fall behind your teammates, as the camera sure won't wait for you to catch up, causing the game to kill you if you're too far ahead or back from the rest of the group. You respawn closer to your friends a few seconds later, but it's seriously not a nice way to help newbies catch up to veteran players.
Another slightly nagging aspect of the game is that All 4 One needs to be played with other people to really get the most out of it. I worked through probably about half the game by myself, and the other half with a co-worker, and it's clear that All 4 One is just plain better when played with other people. If you're playing solo, the game will give you an AI partner that's competent enough, but he'll spend a good chunk of the time hanging out on your characters' back during any lulls in the action. It was actually kind of depressing to hear my character say the same handful of one-liners over and over while jumping around the level all by his lonesome.
With other players there's a much greater sense of camaraderie in knowing there's another person helping you figure out puzzles and watching your back in a fight, or at least laughing with you during All 4 One's hilarious cut scenes. There's more of a chance to plan out a strategy for taking down a boss and for using the various weapons and gizmos designed to help fellow players to deliver the killing blow. It's disappointing that the single player game feels lacking, even though technically it's the exact same game either way you play it.
Despite some of its camera quirks, Ratchet & Clank: All 4 One is a fun, comedic game that'll do a good job of keeping you (and your friends) playing to see what it'll throw out next.
Bottom Line: Despite the unstable camera, Ratchet & Clank: All 4 One is a hilarious action-adventure with a lot of variety between the platforming, environmental puzzles and hack-and-blast action, but unless you're a hardcore Ratchet & Clank fan, you won't get the full experience playing it by yourself.
Recommendation: If you have some off and/or online friends to game with, you'll all definitely enjoy playing through Ratchet & Clank: All 4 One, though be wary of the blasted camera.