I love that big build he has, he looks so solid and just "there".
Honestly I don't see anything wrong with him. He looks like an excellent riding horse, regardless of what you want to do with him, speedy or slow.
Of course, you could nitpick and be that his head isn't super refined, his shoulder isn't super sloped, etc. But unless your breeding, it really don't matter son
He's one of those horses that make me think, "Built To Last"
(you know, I will happily swap bodies. My narrow gelding for your big sturdy one, waddayathink?)