In my opinion, if your Win/Lose ISN'T above 50%. You're bad.
60% is Good.
70% is Pro.
Also, if your K/D isn't above 1.00. You're terrible for Slayer games, probably objective too.
For those of you who want to see/post their W/L:
2. Type in your gamertag.
3. Copy and paste BBCode onto the forums.
I wonder if anybody's going to beat mine or Fluffy's stats... lol. (fluffy, you're only sightly better :P)