I think the ratings given are good, but personally would downgrade both Mario Kart and F-Zero.
Mario Kart Super Circuit won't appeal to everyone because the controls are different from other games in the series (not bad, but definitely different) and it's much more skill-based than what is now considered "normal" for Mario Kart. That said, it's a solid game considering the hardware, an excellent single-player racer for old-school gamers, and a game that I really enjoy playing again. Too bad that multiplayer modes are currently disabled - I am still hopeful that Nintendo will change that in the future as they've already said that NES games will have multiplayer added eventually.
Sadly, F-Zero: Maximum Velocity hasn't held up as well as Super Circuit. Even upon release (and yes, I owned the game at launch) it was a disappointing game with incredibly cheap AI and weak gameplay. Races devolve into puzzle-like matches where the biggest challenge is not to read-end the endless stream of cars you are lapping while waiting for the right place to use your boost. A tight limit on the number of racers on-screen at any one time, computer racers that steer as if they were on rails, and plenty of rubber-banding to ensure any slip-up is punished all combine to make this entry in the series very forgettable. While it made a nice early showpiece for the speed and power of the GBA system, years later there is little to go back for.
But hey, everyone has their own opinions, right?