My thoughts: The DLC has been fantastic so far. I've had a ton of fun with the tracks, and the only one I don't particularly like is Neo Bowser City. I think my favorites so far are Big Blue (I like this one significantly more than the previous F-Zero track), Wild Woods (just gorgeous), Baby Park (classic) and Animal Crossing (my new main is Villager, and this one is seasonal, so it's perfect). I also love Super Bell Superway; I have an affinity for realistic Mario Kart tracks along the lines of Coconut Mall and Sunshine Airport.
As for 200cc, I've only played one cup with it but it was intense. Way faster than 150cc. I don't know how I'm going to do more difficult tracks with it, lmao. Also, getting 3 stars in this mode will be a pain, I can already feel it.
Overall, I like this DLC pack more than the first. Which is surprising to me because I like Zelda more than Animal Crossing. It really seems like the developers have fully realized the game's potential and are just going all out at this point, which is great! Hopefully we see more content in the future.