Is the game clock on the score board inaccurate when the game is lagging?

I stopped playing for a while becuase I'm tired of assholes desynching and or cheating to get the almighty win. So today I came back and played in a "nooby fun" game. Two players on the other team promill and De-Generator had low ping before the game but during did not. The game lagged like hell and people started to quit. I quit at 2 minutes and change on the clock but on pantheon it said the game had gone 11 minutes and gave me and every one else except coincidently promill and degenerator a loss.

This is an amazing game and I really like to play, but the frustration level is rapidly rising.

Any way I'll stop pissing and moaning now. If any one could shed some light on the clock issue I would appreciate it.