From Chapter 10:

"I have three unanswerable reasons for disliking Colonel Brandon: he has threatened me with rain when I wanted it to be fine; he has found fault with the hanging of my curricle, and I cannot persuade him to buy my brown mare. If it will be any satisfaction to you, however, to be told that I believe his character to be in other respects irreproachable, I am ready to confess it."

Even Willoughby, who does not like the Colonel, can confess that the Col. has an irreproachable character, that he doesn't delude himself about the weather, he's not afraid to poke fun at a young man following the latest fashion (the curricle, and I'm sure it was gentle fun) and he's a good judge of horseflesh!