Assassins Creed, became monotonous after the 2nd visit to each city, i could barely put up with all the repeatative seek this, do that missions, but slap onto it the same skins as the 1st levels no thank you.
Oblivion, Fallout 3 without guns, bleh, especially with my lack of patience.
Half Life 2, it was alright and interesting to begin with, but i felt every area dragged on alittle too long, and i always felt like it became more of a chore, before eventually the next set piece, section came in. episodes 1 and 2 are an exception, i enjoyed their pace.