Top 5 Single Player and Multi Player Experiences?

[smroadkill15]

*edit* changed a couple of mine.

Single Player:
Mass Effect series
Assassin's Creed Series
Portal 2
Halo series
Pokemon Gold

Multiplayer:
Halo series
Gears of War 3
Call of Duty 4
Left4Dead 2
Super Smash Bros. Brawl