Matchmaking broken

Seriously, your matchmaking is broken as fuck. Sometimes I'm put with a plat and diamond vs all silver and gold. Sometimes I'm with all silvers and golds while the other team is plats and diamonds. Sometimes it's 'balanced' and we both are equal. Except 99% of the time the other team has 300-400 mmr higher than mine. Sometimes it's enjoyable. But I cant ever try something different or new. Since I'm only silver and still learning a shit load I don't know how to decent on new things. So I end up getting my ass kicked and put on tilt because even though I've never done it. Even though they know what to do against me. The times it's enjoyable is when I play the only Champion I know well. Janna. And even when I do good it still can be a crap game, because people like to think you can push the entire team into their base and auto heal everyone to full health in .01 seconds and then they rush a 1v5 Expecting me to pull off some god tornados that are 1000 units wide and 5 second knock up. And when I try something different it's complete hell.