Check other critic scores and Gamespot is actually hovering around the average aggregate. What could go wrong with Tri? Great graphics, tense and exciting boss battles, best online system ever done on Wii. Gamespot cited the use of the Wiimote and long animations as drawbacks. I haven't played the game yet so I can't say for sure though.
But whatever, no other Monster Hunter has made such a splash anywhere outside of Japan. Even if this isn't excellent, it's a good start.