I don't think that there's as many as there used to be before BE, you have to realize that there will be some level of cheating going on regardless of solution used. I'm playing on Citadel silver districts and having average 50% victories or less.
In my point of view, i can say there are a lot of cheaters on Citadel. Still - Every time when i play 1 or 4 matches, i get a cheat opponents, like this video shows:
and btw, what is your main character name?