I generally try to get the full gamerscore in any game I play unless it turns out to be a terrible game (I'm looking at you, Beowulf). That said, if the game requires an insane amount of tedious repetition to get the full gamerscore (Gears of War 2 for example) or getting the full 1000 would just frustrate the shit out of me (Arkham Asylum), I'm not going to get myself all angry trying for the completion. The gamerscore means nothing to me (I know it might look otherwise with games like Avatar on there, but that was for a competition which won me a free game) but I do take pride in some of the more rare completions I have like Splosion Man, Braid, Sacred 2, KUF: Circle of Doom, Left 4 Dead + DLC, ect.