That's complete bullshit.
If you're mid & you do decent on your lane not get completely fed just decent to the point were you've farmed & maybe made one kill, but bottom feed the AD carry & top feeds enemy jungler, by 0/5~ you can't carry it, there is a chance you may win the team fight faze but with the enemy being that strong it is literally a stuggle, it will boil down to team setups & if you don't have one that completly demolishes what they have then you arn't carrying, does not matter how good you are, i know you like to think your the shiznit, but LoL is a team game, you can't solo it.
That's not including baron/dragon situations, you may get baron & win, this has happen afew times before, but again when the enemy are that far ahead if they have half a brain, they've normally got wards everywhere & an oracle stomping out any ward you have, with complete map control & a decent fed team compared to the puny stragglers you have on your team.. pfft.
But yea, please tell us about how you rofl stomped the enemy when your friends are 0/7 by 10minutes, you win the RARE occasion when the enemy slip or you have a decent team setup, but mostly likly if your team is that bad at the beginning you ain't doing jackshit by end game.
Oh & i say 0/7 because i've been in a game, where both the support & the AD carry both had 7 deaths EACH by 8 minutes, some of the crazy shit people manage to pull off, i mean i feel you if your having a bad day, but dude.. self control, focus your inner chakra or someshit, 0/7 by 8 minutes is just retarded.
This doesn't happen all the time in my games, but i say it mainly because i spectate alot of my friends games & he's probably the same skill level if not slightly better, but he gets matched with these types of people more than i do, he's stuck at 1000~ elo, calls me lucky because i managed to pull out at least & get 1300 so that sort of bullshit doesn't really happen to me, but god damn when it does it's annoying.
We can even add in the people who leave after they've died 2 times aswell if you want.