Yes he is unbiased. Geeta seems too emotionally attached to her contestants, which is not a bad thing. But she does not provide them with any constructive criticism on their performances, though she does advice the contestants from the other groups. Remo is alright when it comes to giving feedback, but again shows a preference for his contestants. With Terrence, he treats all the contestants equally and is more critical of the ones in his group.
On the aside, I love Terrence's choreography. I wish he would choreograph more in bollywood movies - it would definitely be a refreshing change.