I got the game the day it came out and while the content is low in the number of courses there still feels like there is enough to do.
I think the season pass thing is a rip off. they are making you pay 45$ for a game that world be normally 30-35$. Paid DLC is always tricky. I always fell like they hold back parts of the game so they can just sell it to you later.
If you enjoy the Mario sports games you'll probably like this. I'm just sad that even though Camelot did this game it isn't as RPG rich as the one they did on GBA,