My nephew and I have been playing the beta for a good deal of time and I actually like it. You could have one of the more powerful tanks in the game, but that won't really amount to anything if you're crap with it. But that's the fun of this game. Choose which tank class you're good with and go for it. Are you a hit-and-run type of player? Light or medium tanks are good to use for that task. Want to fight from a distance? Use a tank destroyer or artillery. The number of tanks, even in this beta, are quite plentiful and every one of them is unique.
It's a shame that none of the progress in the beta will transfer over to the real game when it releases (meaning I'll have to work again to unlock that T29), but if nothing else this beta helped me pick out the tanks I'm good with and the tanks I'm not so good with.