I'm playing in a 4 man premade and we always seem to get the worst 5th players ever. Take this Renekton. He was never in a team fight, ran away from at least 6 ganks that were so easy it wasn't even funny and somehow he gets placed with a 4 man premade that has a history of doing relatively well. In other games, I often find one team wins almost from the start. The other team gets so badly outplayed, regardless of whether the match goes beyond 20 minutes, there is no way they could win. Normal games are especially bad.