I think it's worth a look. The toeing out you should be able to fix- my mini had to get trimming to fix his when he was 1 1/2 y/o.
He may have those problems, but all horses have problems. The question is the severity of the problems and how much they'll affect him in the future.
Right now, he looks decent enough to look at. But please please please don't just buy him because you have the new horse bug. Truly evaluate his legs and movement.
Let us know