Pff i'm kind of pissed off right now, what with being a super effective player and still losing... Like, last match, i played sivir in dominion, i go bot, crush ryze, cap, only to find that the rest of my team can't get top. I help left and right, stop captures all the time, cap/recap, kill a bunch of people, but the team just doesn't follow, dunno if shacos just always spend half of their playing time in bushes doing nothing, or if fizzes always suck, but i sure am getting a lot of these nowadays. I think in the end they won only because their tryndamere was super annoying, playing with +5 boots and 3 phantom dancers, trying to capture every point left unguarded and running away all the time. Either you devote 2-3 players to stop him while the rest of his team caps everything else, or you just interrupt his captures and he's back 3 seconds later, or at another point.
Other than this one game there was a series of ranked games that i played, where i was always team captain (choosing the bans), and despite playing a bot AD carry with no room to farm and not really trying to grab kills(while the mid ap carries kept failing hard), i was always way above the rest of the team in terms of K/D ratio (stuff like 7/4/x with 3 of my team being at 0/10/x). And those same people with 0/10 always spend the match saying how X should do Y and take this item and this skill and this spell (and how my champion/spells suck, and that's why we lost, despite me being the most successful team member).
The one ranked game i won today, i was playing Soraka and maybe i was doing too good of a job, 'cuz these bastards kept tower diving full hp enemies with like 10% hp themselves. Morons. I can't even start counting the times i barely saved their asses by silencing their targets and refilling their lifebar.
/rant