If you love action adventure games, love Ratchet & Clank games, or just plain like having fun, then look no further.
Visuals: 10 - ABSOLUTELY BREATHTAKING. The best graphics I've ever seen. Despite hearing this a lot or having your doubts, I'll first hand tell you that the graphics rival a pixar/animated movie, with SUPER clear edges and textures (no jaggies whatsoever), all running at a blistering 60 frames per second that never even hiccups. 99% of the cutscenes are done in real-time, in-game engine and look fabulous. Truly a showcase of graphics and skill here.
Sound: 9.5 - Music that well fits the mood, including a particular awesome epic tune within. Voice acting that is incredibly well acted to perfection, including tons of humor. Guns all sound about how you'd expect, and overall nothing sounds out of place. The only thing stopping the sound category from reaching a perfect ten would be a highly memorable main tune that I could hum/get stuck in my head. If that doesn't much matter to you, then consider this section a ten.
Replayability: 9 - With the main storyline lasting a good 12-14 hours, a harder difficulty after you beat the game that lets you keep all your weapons and such, plenty of unlockables (cheats, concept art, skins, etc), and an overall fun factor through the roof will keep you coming back to this one for a time to come.
Overall Average: 9.5 - If you love action adventure games, love Ratchet & Clank games, or just plain like having fun, then look no further.