To make it short, there is no elo-hell in league of legends. If someone is better than his current elo, his elo will rise. The only problem with this system is, that its not designed for five versus five and there is a random factor in it: the other 4 people in your team and the five people in the other team. There is just this random factor in it, which makes it hard to win. Basically you raise elo when you do well in most of your games and not in only more than half of your games.
What's your opinion on this? Comment please