1. Metroid Prime 2 HD
2. Metroid Prime 3 HD
3. Metroid Prime 4
4. Other stuff
5. Something else
Not a totally serious list, but I've been holding off replaying Prime 2 and 3 since rumors of Metroid Prime Remastered came into existence. That did actually come out, and it was an amazing replay experience. However, 2 was my favorite in the series. It's the hardest, but for me, it had the best music, atmosphere, and it's the only one I ever got into speed running/sequence breaking.
I'm gonna blow my load if/when the day finally comes where they do a full Metroid direct. I've been waiting patiently since 2017, but with Prime 4 finally slated for this year, they can't make me wait that much longer, right... Right?