First person shooter: Far Cry

Third person shooter: Infamous

For 90% of the games I've played, I did 1 play through. I find it pointless to play it again just because I'm better at it the second time through,

Then there are games like Infamous, Dishonored, Fable, which offer different options on the second play through (whether those are decisions, activities, alternate endings, different gameplay style), those make me want to play the game one more time.