I think it is more of a difference between experienced vs inexperienced. Unity hasn't been around as long as the devs behind braid, super meat boy, or minecraf

I think it is more of a difference between experienced vs inexperienced. Unity hasn't been around as long as the devs behind braid, super meat boy, or minecraft have been making games. Most of your experienced indie devs will already know how to program, or already have a game engine they like to mod. So you are going to have to wait a few years for kids who picked Unity over OpenGL or Half Life mods to become experienced enough to make something great before you can really make that call.