If you go T4, OP Werfer can save the day.
Tiger is a bit better with the extra range.
Don't listen to him, OP. PzWerfer is not OP, it finally worth building, and it does a good job, that's all.
Tiger has its extrarange allright, somewhere between a P4 and a Panther, but it's still a Fat panzer IV and nothing more. I'm not calling it UP but it's not what it was some time ago....
Oh, and there is one more thing these guys forgot to tell you: you cannot spam heavies anymore. They are limited to just one at a time, and this added some strategic depth to the game together with making tiers more appealing which overall improved the gameplay.