Eh, he has a short back, he is cow-hocked, and looks knock-kneed or toed out on the front. He is a probably a pretty good using horse but if I was looking for something to breed, I would look somewhere else.
I must agree with what everybody else has said.
He is way to pigeon toed.
He may have a nice temperment. I don't know. But if you are going to have a stallion for breeding he should have good conformation and temperment.
Frankly there are to many stallions out there and to many breeding horses just because they have a stallion or a mare.
There is a saying a wise horseman told me once "a good stallion makes an even better gelding".