Any game with leader boards after every match/event. It must be significant and not 1 point, 1 second, or anything that defies a small win. Full lobbies also. Not you being miles better against one player. For example, my domination last night:
I don't have the screens anymore, but I remember my first game of Battlefield 3 (Xbox 360) where I finished first with my score more than the double of the guy in second place. Same thing with Battlefield Bad Company 2 on the 360, but I played it years after it came out. Sometimes you really have to ask yourself if you are actually good or if everybody is terrible at games.
I don't know if this counts or not, but I realised a few months ago that I was pretty good at Space Invaders in comparison to all the Twin Galaxies scores. That's my highest score so far (unfortunately I didn't video it, haven't bothered setting that up yet until I can confidently beat 50k). This would place me at 4th on TG: http://www.twingalaxies.com/scores.php?scores=5205
