In Cod4 - No
In WAW - Yes Twice, great fun
in Mw2 - No, never reached max level, stopped playing for obvious reasons
And in Black Ops I am nearing lvl 50, which really flew by, maybe its just because I am awesome at the game.
But no I wont be prestiging, EVERYONE will be prestiging, why not be different. Anyway I put a lot of work in getting some of the Pro perks, and I am in no rush to get rid of that work. I might try unlock them all and try see how many challenges I can complete. I will probably stop playing soon after that, unless it stays really really good, which I have a feeling it might.