The first one: I like him as a horse, but for breeding - Holy upright pasterns! He also has a longer back so wouldn't be the best match.
Driftwood something: Eh - I can't see anything glaringly wrong, but there are no good confo pics, and he just seems kind of 'average'...
Pally paint: I quite like his build, though looks like he hasn't done much of anything so he isn't tested for performance. He has a nice short back though and his neck is pretty good, nice shoulder too.
Last one: Can't tell a thing from that photo, and he also looks to have done nothing of note.