In hearthstone I'm stuck on the platinum rank, I only have 1 star, I've won 50 games since then and still didn't progress to star 2 or even 3, am I doing something wrong?
I think the issue come from the level of the opponent you won against. Currently there are not enough players in the game (Which is still in beta) to always find an opponent that allows you to rank up.
As posted by an admin on http://us.battle.net/hearthstone
Matchmaking functions similar to SC2. You have a hidden rating that rises and falls based on your wins and losses, and the amount it rises and falls depends on the rating of the person you are matched with.
As more people get invited to the Beta, you should see an even better spread of people matched against you.
All of your answers are wrong.
If you are not promoted it is because you do not have the mmr to do so. I built a paladin deck with basic cards and <5 rares and 1 epic (faceless manipulator) after receiving my beta key 5 days ago and have already gone to diamond 1 star before the changes today. I am fairly sure you are ranked for deck strength as well because my deck was horrible but I played smarter than others and was therefore promoted even if I didn't win all my games.