I agree, his bloodlines may be great but his body tells another story. He is not what I would call a cow horse or a reining horse. Granted he is three but there is no hip to him, his head is long for a quarter horse and in my opinion lacks the intelligent cow eye. His body is long in my eyes, Quarter horses around here are more compact. I too dislike his legs. His front looks like he is a bit under himself and over the knee, his hind legs are to strait for my liking and to be quite frank I don't see any thing really pleasing about him. To me he does not have any " quarter horse" characteristics, I would pass if I were looking for a good quarter horse to take into one particular discipline.
On a good note, he is healthy looking.
I am not a pro so if you like his personality than he may be great.
Best of luck to ya!