Fine, I'll explain what I like and don't like out of all that.
DLC tracks are always a good thing, provided they're made after the game is released.
Proper Battle Mode courses are also fine, you know... If I actually cared about Battle Mode.
Mario Kart DS still has the best Battle Mode.
Stars are a bit underwhelming, I give you that.
Mushrooms, however, are just fine as they are. It's knowing when to save them for shortcuts. Not how fast they go.
If the coin item gets removed, it'll become far too easy for one person to cruise out in first and stay there. Then we'll have the same problem that Wii had. Do you REALLY want that?
Yes, it is totally unfair when someone in 8th or so gets it, but the guy in 1st is getting it more often then you are.
The coin is a lot more elegant than most people give it credit for.
And also, if you're not trying to collect 10 coins in every race, then you underestimate how much of a difference coins make.
The coin is the single best change to Mario Kart. Along with the one item limit.