Call Of Duty :Modern Warfare 2 single player = Boring zzzzzz

I managed to finish COD:MW2 single player around 8-10hrs in hardened difficulty. the story is shorter than MW1 the only good part of this game is the multiplayer experience but I never tried it yet because I am using a pirated copy of the game. I hope I can play the game in muliplayer using Gerena so I can play with some of my buddies there. I am playing Assassins Creed 2 at the moment to kill some boredom. I am also using a pirated copy of the game and I managed to find a crack for it after several trial and errors.