To this end, CI Games won't be releasing the multiplayer and single player portions together, so as not to «dilute any potential from the single player experience.» (cogconnected.com)
The overall single player portion of the game is solid, giving you the full Hot Shots feel on the PSP. (darkstation.com)
Remember, the list isn't about who is playing multiplayer the most — it measures the amount of people playing games * while signed into XBox Live * — this includes single player portions of each game (That's why games like Skyrim are on the list). (majornelson.com)