There's no real ELO hell if you think about it.
What do players consider the "ELO hell"?
At some point your own ELO rating would (could?) be so low you'd pretty much always play with teammates that are - in short - too dumb to play the game. So you'd lose every match, there'd be no way to raise your rating anymore.
Why it's a non-issue:
While this sounds quite serious, it can't be that bad if you think about it.
The pool of similar rated players doesn't only fill your own team. The enemies are picked from those as well!
So even if the other players on your "tier" are literally too stupid to even move their champion off the summoner platform, so will your enemies.
If you're really better than all of them, you should be able to carry your team to victory. And even if that's not the case, the chances are still like 50:50 winning or losing. It's not like the game magically puts you in a "ELO hell team" vs. a team of better players. While that might happen, it's still very unlikely.
And even then, you don't have to play on your own tier. Play with some buddy who's got a higher rating and you'll play with/against other players of a higher rating (not as high as your buddy).