I blame other players.
In TF2, I'm playing mostly medic. There are games where I'm doing insanely good, assisting like crazy, performing perfectly timed kritz/uber charges, and win that thing together with one or two other medics, which know that it's fucking important to heal each other and not just that big russian guy they're running after, in an sometimes incredibly short amount of time.
And then, there are games where I'm running around, dying pointless deaths, and barely being even able to heal since I've got my hands full getting raped (With threatening lack of lubrication.) by all kinds of things; snipers (Which can do as they wish since our own snipers are getting their asses handed back by them and the spies. Gods I hate sniper players who are nothing but spy training dummies.), spies (Since our pyros need to do THE KILLINGS OF THE ENEMIES.) or randomly waste my charge on a demo so he can't even kill that single sentry over there IN THAT CORNER.
That's also why medic is my favourite class - I can blame other people if I suck.