Without unnecessary recommendations for the game, I will go straight to the +/-.

+
1) We are not talking about simply upgraded graphics, but the depth of detail they have designed in each track is out of this world!
2) The AI has also been upgraded and sometimes, even on medium difficulty, it can be challenging.
3) Extremely fast gameplay. Having spent countless hours on the original CTR, during the first hour of playing the modern version, I thought I was playing a different game until I got used to it!
4) The kart customization is satisfying. It offers plenty of options for each character in terms of skins, paints, body karts, and stickers. They do not affect the kart's performance in any way, unlike the Mario Kart series.
5) Huge content and there is even more to come... for free!
6) The company decided to keep the classic style in many aspects, offering it as an option in the adventure mode, allowing players to either play the soundtrack from the original or use the turbo bar from the original, for nostalgic fans.

Neutral
1) While the AI may have been upgraded, on hard difficulty, the experience can be frustrating at times, which might be a bit overwhelming for new players.
2) Various extras such as skins, etc. are unlocked through the in-game store using currency collected from races. When playing offline, the earnings are not as much as when playing online, resulting in grinding being somewhat tedious. Additionally, an internet connection is required, regardless of whether you have a gold/plus subscription or not, for the coins.

-
1) One and only, the loading times can be somewhat long in some cases. Especially when finishing a race in adventure mode and transitioning to the world.

I hope I helped. I give it five stars because despite the loading times, the experience I get from this game is something else.
Leave the comparisons with other kart games aside and enjoy!