Just got the game! And I love it! Some minor complaints though
~I fell Honey Queen's name should have been listed as "Queen Bee". She was usually told by that in the Galaxy series and it feels weird calling her something else. I won't be her anyway, though. My sister wanted me to be her and she was so annoying.
~Some of the Retro Courses changes. Some of the retro courses changed to much for my liking (Daisy Cruiser). Used to be my favorite Gamecube course, but it's just not as fun for some reason now.
~No Single Player V.S: Only time trial. Would have likes this feature.
But, there are a lot of pluses!
~Online Play: I managed to find my cousin so we played races. The join feature is awesome.
~Balloon Battle: I find it way more fun than MKWii
~The new courses: There are a couple bad ones, but I some of my favorites may be (from a first play perspective): Shy Guy Bazaar, Music Park, and Piranha Plant Pipeway) Some bad ones would be (Wuhu Loop and Neo Bowser City)
Overall, the game is amazing! I have Queen Bee, Shy Guy, Wiggler, Daisy, and Wario unlocked, and will unlock the rest today.
~Local Multiplayer: My sister and brother played on this for like 2 hours. Really fun!