It's Mario Kart, so it's damn solid kart racing with fun tracks... but it's saddled with the baggage of being a now 5 year old game that was a port of a game that was 3 years old at the time of the port's release. Thanks, Nintendo tax!
If you can get it on sale or with a gift card it's totally worth it, but 50-60 dollars for what is effectively an 8 year old game is way too high!

The only game I can unintentionally play for five hours.

you can only start having fun with this game once you give up on silly ideas like "weapon balance" and "heterosexuality"