My thoughts on the current state of the game
I've been playing for something like 1-2 months. One of the first rank game I've played someone played an apparition and pretty much destroyed my noob deck that's where I understood that was the way to go. I was nearly right from the get go and it does turn out that brainy or the fact of playing after the plants is incredibly strong in general and one of the best strategy.
Due to the structure of the game the plants are always pretty much the aggressor. If zombies have a 4/1 and plants have a 4/1, by default the plant is the one that decide if they will trade or if they will do dmg. This make a 4/1 for zombies very bad while still being something you can play as a plant.
So since plants are the agressor this make the zombies into the defacto control game. How can you play control if you have to play first? You can't. This mean that you have to heavily play tricks and play last that way.
Once I was about rank 20 I was convinced that the best decks in the game would be professor brainstorm, with maybe immorticia 2nd due to the fact that they basically have all the good and relevant cards + pretty good powers. I was facing alot of brainstorm and having my occasional lost to those decks.
At this point I got captain combustible and kinda like the brainstorm/immorticia heroes I predicted he would be one of the best plant due to having the factions with basically all the good cards. At first I felt that his ultimate power (+4 atk) was a bit weak since it wasn't a removal but then I discovered re-peat moss and how good it was with that card and this deck was catapulted to top tier, pretty much in a category of it's own.
I could expand on why the captain is that good but basically it's a rush deck that can combo you out. If you've played any hearthstone or any card game you know that combo decks are always dangerous and even more so if they are also zooish/rush. Since you never face a plant hero there are no mirrors, the zombie is forced to try to catch up or play control and they usually lose. Prof brainstorm would in theory have a decent way of beating captain, but giga offer one of the best counter to trick heavy deck with the black-eyed pea which can win a game vs brainstorm pretty much by itself unless he has an immediate answer.
After captain I think the best decks are brainstorm and immorticia, not too sure in which order. Immorticia is less vulnerable to black-eyed peas maybe so depending on how much people have caught on and how many they play, etc.
My final thoughts for this already too long first post is that I feel the game is not balanced very well. The 10 classes are not balanced, the heroes are not balanced due to that and some of the cards are specifically not balanced. If this game has any chance of living a long life it probably need nerfs, new cards soon or basically some tweaking in general I feel.
If this discussion gets going maybe we can go into specific classes or cards and why they are good or suck.
Thanks!