Because people realized that even though it got mixed reviews, its Conkers Bad Fur Day (one of if not the best looking N64 games, and one of the best overall games for the system) with super good graphics. And it's Conkers Bad Fur Day + more multiplayer, and also because people have most likely relaized Rare hasn't made a good new game this generation.
>It's just a prettier version of the original game...which wasn't even very good.
What wasn't very good? If you mean this version then yes and no, it's a not very good version of the original. But the original game was very could, and had a far far better multiplayer than this version.
When you've finished here, don't forget to visit: http://z9.invisionfree.com/Nintendo_64_Forever/
My main problem with the multiplayer is the explosive weapons have blast radius that are way too big and do too much damage. If you thought the blast radius was big with the hand grenades in Halo 1, the grenades in this have a blast of 8-10 meters and the sneaker class snooper drone has a blast radius of 20 meters or more.