I always try and complete a game the first time through really quickly, to get the point of the main plot.

And a boss battle has to be that, cant stand it getting to a boss and wipeing the floor with them.

in Silent Hill 2 when I kill someone I must get my rusty metal pole out and whack them untill they stop squelching, and I always try my best to see the worst ending of a game first so I know iv started with the worse and it will only get better from here.