This is a primary reason why I don't play ranked. In casual, I can play whatever deck I want, and if I don't win, oh well. People playing Ranked matches are generally in it to win, and win at any cost. If you can be beat with Radovid regularly, people who want to win are going to play Radovid. Same with Monster Consume, same with Savage Bear Punishment.
If you want diversity, you're doing it wrong.