I voted "clean"
I was quite addicted to Diablo II, years ago, for a long time. Then I quit (mostly thanks to SHII, III and IV).
Then I fell for WoT, was there for some more than a year, but last may I said goodbye, I hope that forever.
MMOs were bad enough, but "free to play" model makes it expensive! Something they were not before. In world of tanks, paying premium (subscription) is just the first step to be competitive, then you have to keep paying other 15-20$ a month if you want to be among the top... thats a lot of money at the end of the year! So