1. The single player may be short but it's great. If it were just the single player alone the game would have been somewhere in the 8-9 range but luckily it wasn't. Gears was made to be a multiplayer with the single player and co-op that is a great diversion and even serves as a great tutorial for multiplayer. There are also multiple difficulty levels that makes this game just fun to play through at least twice.
2. I haven't played a lot of the multiplayer (I'm just not good at it) but there's more than just 4v4. There are several different game modes and many different maps. On top of all that, it's a great multiplayer.
3. I had a third point but I forgot this in the process of skipping this to go ahead and type the last part before I forgot it. >_>
To say that this game is just a half game only shows your ignorance. Don't take this as an insult, it's good to ask questions, but Gears offers a short but sweet single player, a very nice co-op mode, and an excellent multiplayer mode that's great. Remember, it's not about quantity, it's about the quality.
