The difference between a good horse and a bad horse relies entirely on what you're breeding for and your personal standards for reaching those goals. Something worthless to one player may be the pride and joy of another. There's no "right" way to play this game.

Now, most of your horses are unrated for the three traits and none of them have bravery ratings. This makes them hard to judge. What I can tell is that they don't have any special colors. Though they aren't genetic tested, we can assume they probably wouldn't be a good bunch to use for breeding rare colors/patterns.

Read guides, stalk FAQs, and get your horses rated/tested. Then you can judge the worth of your horses for yourself. :)