I'm agreeing on a few things:
Metroid Prime is the best GameCube game in my opinion, too. I definitely loved LoZ:Wind Waker but Metroid Prime was the game to make me feel like buying the GC was totally worthwhile. It's one of those rare games that just makes me feel like I'd really be missing something if I wasn't playing these games.
Metroid Prime 2 is a lot harder. I actually never finished it cuz as I got closer to the end I started to feel like I wanted to backtrack and look for the stuff I missed... Then I got so far that I just felt like I'd rather just start over from scratch and I just never did.
Both are worth picking up. I think GameStop sells used copies of both for somewhere around $6 each so that's not bad at all.
I'm curious why Ronald would look forward to MP3 if he hasn't liked the others though? I mean the biggest difference will just be the controls, really, but it's still Metroid Prime. Hopefully it has online, but again... it's still Metroid Prime. If you didn't like the others, what makes you sure you'll like this one? Good on ya for giving it a chance either way, though.