I can't speak for other goat breeds but our Nigerian Dwarf goats make fantastic pets! My girls are both very good tempered, playful, and affectionate. I can tell when someone is in the yard because if the girls spot them, they start bawling. Just like a dog that barks. They tend to want to jump up on you to get your attention. Since they are only get about 22" tall, they don't knock you down. We got these two about a year ago and I've never regretted getting them. In fact, David has been looking at getting some more to add to our family.
And of course, I'm planning to have them breed in Oct or Nov so we will have spring babies.