Huh, I agree with the author. I'd like to have 3-4 dracotaurs. They are, after all, a CR 3 monster usually found in groups. It seems like the kind of rare that goes for $6-$9 on the secondary market.
And dragonspawn? I don't mind them. The green one looks very much like a classed lizardfolk, the other one is a blue and I love blue dragons. I have to give the author credit for admitting that not everyone likes dragonspawn, but you can't make everyone happy.
I really like this set a lot. There are a lot of solid monsters in the uncommons, and nice common figures I didn't have access to before.