Motorstorm is highly addictive. You've been warned!
Single player is good. You have a ticket system to race through which progresses through various levels. Placing 1st - 3rd qualifies you to the next race, and scoring above a certain level unlocks additional ride (which are also available online). Multiplayer is awesome. Really elevates the game's fun-factor and is totally combative! I threw away countless hours day one on exploring all facets of the online experience and had a great time - trashing talking your recent victims, screaming as you just lose a race at the last second, and laughing watching the incredible wipeouts. Yes these are all in the single player version as well (except the talking to other's part) but it is just not the same.
Graphics- best looking game so far on the PS3. Gorgeous!
Sound - The soundtrack is great. Engines rev and explosions are explosions.. but the killer part is the lineup of tunes that really get you psyched for the match. Playability - Nice and simple. Boost, Drag, Accelerate and break. This is also one of the first games too take advantage of the Sixaxis controller for steering. While your waiting for Gran Turismo HD, you should get this!