well I had an epic game yesterday that lasted an hour and 15 minutes, that thank the lord ended in a victory. I was playing karthas and ended up around 20-15-18. The kill tally was 62-64 with us down by 2 deaths, but we were able to take baron 3 times, not to mention kill the dragon countless times over the course of the game to make up for slightly less kills. In the end both teams were pretty evenly matched and it came down to skill and a better team makeup, since everyone had enough gold to by any items they wanted. (I had over 5k gold surplus)
I had over 800AP on karthus and a lichbane, and I could basically keep defile on constantly. You can imagine how painful it was to even be close to me with defile doing over 300 damage per second and my ult would do over 1000 damage. Neither team could secure an ace, and it was really hard for the enemy team to push a turret, since I'm still kickin for 8 seconds after you kill me, and my ult plus defile radiating around my turret basically kills a push.
I guess in the end I can thank our kamakazying pantheon, which would jump on turrets when the rest of thier team was distracted and try to take them down as much as possible. He died at least 5 times doing this, but he got thier back turrets down this way, if it wasn't for that, we might have been at an eternal stalemate till people started to quit.