This is the first Metroid Game I have ever played. The Nintendo WiFi Connection adds a much needed multiplayer aspect.
The Nintendo WiFi Connection is, without a doubt, my favorite part of this game. I find myself getting whooped time and time again, though I'm encouraged to improve my personal record. And to discourage the sore-losing cheaters out there, Nintendo added a publically displayed Hunter's License, which will show your Wins, Losses, Kill Records, as well as Connection Rate.
The graphics are impressive. There are chunky parts at times, but for the most part, they are quite awesome. Each missile explosion and fire ball are animated to the DS' standards.
Gameplay is fun, but not if you don't have Nintendo WiFi. If you're going to get the game just for adventure mode, you will be bored, in my opinion. I can't compare it with any past Metroid titles, for I have played none. But for someone who wants a fun game that they can challenge their friends with via WiFi, than Metroid Prime Hunters is a game they should consider picking up.