Wrong. 4/4 is fairly large for an early game threat. And he's much much bigger by the midgame.
By the time you reach threshold, he will be a 6/6 or bigger without you having to use his ability at all.
Of course, you can use his ability to help you reach threshold faster. You can use it to combo with Top. You can use it combo with CB + Top. You can use it to Waste away opponent's lands and cut them off of a color.
And you can do all this while using him as a very large blocker.
Like I said initially...
I'm using him against aggro. The plan IS to use him as a blocker in the early game.
He really is a bomb against aggro. And a must counter/kill asap threat against control decks too, same as Goyf.
He starts off as 6/6 blocker in the early game thanks to his ability after all.
And with all the removal floating around, I needed another bomb against aggro and control besides Goyf.

