He is 32 years, which is pretty old for a backline player.
A small winger playing at scrumhalf, with limited kicking ability.
On a hard fast pitch like in Super Rugby, he is very good on attack, but his Achilles heel has always been clearing the ball from a slow ruck. (e.g. Northern Hemisphere).
Meyer dropped him after his disaster at the base of the ruck ensured a loss to Ireland, and then Alister Coetzee repeated the same error. Alister Coetzee later said that Hougaard does not have the technical specialist ability for a scrumhalf at test level.