Yeah, since you can look at my match History, you can see that this is not true.
Sure, I have a few games with bad stats, like that 1/7/0 Jax game, which was totaly my bad, I got paired top with a Plat 3 Jax player who totaly outplayed me and after killing me twice and my jungler once just started to towerdive the hell out of me, but hell I am not perfect, and certainly not good enough to beat everyone with a champion I have just picked for the first time...
Anyway, I go off topic... you are free to watch my match History.
You will see that the only games (except for that Jax game) where I actually go negative stats are games where my team got crushed like bugs anyway.