Metroid Prime is a very enjoyable game that i bought roughly about 3 months or so after i got my gamecube. The fact that if you know how, you can actually get certain items before they were intended to be gotten(sequence breaking anyone?). Also, the fact that you are alone on this planet trying to uncover the mysteries of what exactly this odd blueish stuff(called phazon), is and trying to figure out what caused the chozo race to blank out of existance. If you were really into metroid, then this game is for you.
I dont have a link to it, but for those of you who want to see some wicked stuff for this game and who happen to own a non-players choice version of this game, may i suggest this website:
www.metroid2002.com. There you got just about every strategy possible for bosses and other and they're all in video format, a bonus!
For Metroid Prime 2 Echoes, you technically didnt really do that much, but if you didnt mind heavily backtracking through mazes then you probably liked it an awful lot(i beat both 1 and 2, though number 2 takes some getting used to).
All in all, yeah ive played these games beaten and checked out much information on both. Go me.