I would rate this 4.5, but I don't think i can do that.
MK8D is mostly the same as MK8, but the added features make all the difference. The new characters, and better battle modes really make it much more fun. The reason it's not 5 stars is because of joycon drift. This happens to me a lot. Now, if you're a pro at MK8, this is fun. It means you have to constantly be on your guard, and it provides a challenge. But there are times when the Joycon drift becomes really bad. One time, it was pointing so much to the left, that if my stick was pointed to the right, I would be going straight, making it impossible to turn right. That just makes it not fun at all. Overall, I really love this game, and it's worth it for sure.