Well, whenever I have a stroke and decide to buy one of the Black Ops games, I'm usually a decent player and I'm fine with that. I really don't want to aim for the top of the leaderboard every match, be that one guy who racks up 30 kills and 2 deaths, and pops killstreaks like they're going out of style.
I recently got done playing Burning Blood for a while and I put so much work into being a good player. I tried as hard as I could, and hit A3 before conceding B3/C2 was where I belong at my skill level. But I wanted to hit that S rank so bad. But that game is seriously broken for online, and the recent patch kind of shook things up a little too much.
But normally I don't play multiplayer games. I used to play TF2 a lot just when it started getting hatty, and I got to be a good sniper. Then, suddenly, all my skill evaporated and I started to suck really bad. So I quit. I realized there wasn't really a point, no matter how many times you helped your team win, it didn't amount to anything and you could play infinitely. That really took the wind out of my sails so I don't play multiplayer shooters anymore.