I'll criticise Chris for a few things (the gurning, the overbearing cheesiness etc), but his size isn't an issue. He has the perfect partner in Ola, the same way Vincent has had ladies of smaller stature to compliment his lack of height.
Had Chris been paired with Erin, it would have looked ridiculous, the same as if they paired Vincent with Jade.
Being slightly less than average height hasn't hurt Vincent or Darren's chances in competitions! And to be honest, OP, your bashing Chris over this is a bit on the pathetic side when there are many valid reasons not to be a fan of his.