8.2
http://www.gamespot.com/gba/sports/mariogolf/review.html
"Mario Golf: Advance Tour makes good on the legacy of Mario Golf games that have preceded it. The gameplay is easy to pick up, but it has enough depth and diversity to stay interesting, and there's a nice variety of both realistic and fantasy-themed courses to play on. Players who take their golf seriously may be put off by some of the game's outlandish obstacles and its playful aesthetic, but if these characteristics don't bother you, you'll be treated to the most accomplished game of golf to hit the Game Boy Advance."
IIRC, Gamespot gave the original Mario Golf (GBC) 7.0, so the score ain't that bad
http://www.gamespot.com/gba/sports/mariogolf/review.html
"Mario Golf: Advance Tour makes good on the legacy of Mario Golf games that have preceded it. The gameplay is easy to pick up, but it has enough depth and diversity to stay interesting, and there's a nice variety of both realistic and fantasy-themed courses to play on. Players who take their golf seriously may be put off by some of the game's outlandish obstacles and its playful aesthetic, but if these characteristics don't bother you, you'll be treated to the most accomplished game of golf to hit the Game Boy Advance."
IIRC, Gamespot gave the original Mario Golf (GBC) 7.0, so the score ain't that bad