Matchmaking Problems?

So has anyone else been having issues with Arena playlists like Slayer and Arena itself? Ive had two games in Arena where the opposing team had crazy higher level players, im Platinum 3 atm. The first game had a Champion 126, two diamond 4s and a gold guy, the next had three Onyx and one Diamond six. I might be able to understand the constant diamond 1 people i keep playing but Champion and Onyx has me questioning whats wrong with the matching. Is it just me or what?