Seriously who tells you Garen beats GP? You can kite him forever or you could just farm and out scale and there is nothing he can do to stop you.
That being said Critplank is cool but it takes so much gold. I'm still riot has killed the old cleaver, it was stupid good on GP. Honestly since Plank relies on items a lot so when Items got nerfed across the board plank got hit hard. Its kind of the same thing that happened to Ashe. Also how exatly does plank counter Shen or Ezreal?