I can't tell if Starfox 64 3D is worth it if you had the original version since I've never even had a N64. I'm a, let's say, new era gamer after all (I'm only 16) and started playing actual videogames when I was 11 with the Wii. Still, I can say that the game itself is pretty great, gyroscopic controls are fun if you are in the right position to play with them and the 3D effects surprised me greatly. I already am a bit used to the 3D effects, but I swear that there is a cutscene at the beginning where the Arwing actually looked like if it was outside the screen and I went all like "HOLY SHIT.".
All in all, I dare to say it's worth it if you played and enjoyed the original N64 version. May bring back good old memories, I guess.