Well, all joking aside:
-Metroid Prime: As I said, awesome; a must have. It’s just the perfect blend of action and adventuring, and you’ll soon get addicted to exploring every little niche of every level hoping to find some upgrade. The action can be intense at times, especially near the end of the game, however I prefer Echoes’ action over the original’s. Nevertheless, Prime’s what got me liking FPS games (even if it’s not really a true FPS...)
-Animal Crossing: Okay, although can be repetitive after a while and is inferior to the DS version. If doing simple chores like fishing, gardening, arranging furniture, etc sounds fun to you, go for Wild Worlds instead. One of the main points I have against the Gamecube version is having to play it at home can be a bother for time sensitive events, but Wild World fixes that.
-Animal Crossing: Wild World: As said above, if doing the chores that the game is all about sounds like something you’ll enjoy doing, go with this version. Being portable with a real time game like this is a necessity, so WW is far superior to the Gamecube version in my mind. The Wifi I imagine can help add to the game, however I haven’t used it all that much due to it being a pain to use with our router...
-Pokémon XD Gale of Darkness: Well, you’ll get lots of mixed opinions on this... Personally, I think XD is great and fixes a lot of things Colosseum had wrong. Sure, it may not be the same as the Gameboy versions, but then again everyone seems to be crying for change all the time. In short, XD has the same core gameplay as the Gameboy versions (snagging is just the same as catching, people; just with a more limited selection...) but a better story, decent 3D graphics (except for the older Pokémon and even some of the new ones), and a good length.
-Tales of Symphonia: Pretty much among my favorite RPGs ever (Although I’m still having a hard time deciding between it and Skies of Arcadia, which is another awesome RPG available for Gamecube, although hard to find). The battle system, while it may seem like battle mashing at first, is extremely fun once you start getting some of the more advanced techs. The story may not seem great at first, however it picks up speed somewhere around a quarter to a third of the way through the game. Admittedly, the story still isn’t the best, but it’s long. You can easily spend over 60 hours playing even if you ignore most of the side-quests...
The other two I haven’t played enough of (in Fire Emblem’s case) or at all (Hunter’s) for me to be able to judge.