I think it is good as purple because it makes it all more interesting, jool for example is interesting to me because it is green, I think it adds differences to the game however it is fairly similar in that it is hot, and high gravity
Duna, it is awesome because it has an atmosphere, ice caps, a moon and a solid surface, so it is close to Kerbin, so it is great for a base because it has many interesting Easter eggs
I have played KSP for a while, but I am new to the Forums, hopefully I will post up some of my Vehicles soon and become an active member of the Community