Only viable tiers to play at the moment are 9 & 10 in my opinion due to 3/5/7 MM. When your top tiers fail you can at least be one of them fails and blame yourself or have a chance of still impacting the game as a viable tier9. Even tier7s seem to be so much weaker than tier8 tanks that you have a serious problems fighting them. And tier8 itself is broken. Not much to choose from anymore is there?