Yes, it is common at the ELO bracket you are in, and part of it is also luck. When you rise up in ELO this will happen less often. What you can do is befriend those you played with or against whom you think were good players who had good attitudes. Queue for games with them, and it will greatly lessen the chance of you getting teamed with a leaver/afker.
If you have a leaver/afker early game, your team can still potentially take advantage of your level advantage (since there's less people sharing EXP), group up and push to win while you still can win fights due to the discrepancy in levels. Once the enemy team catches up on levels, it is unlikely you'll be able to win.