Playing through this right now. There's definitely a lot I remember from this game, since it was one of the very few N64 games I absolutely loved. And not having to use the N64 controller is an added plus!
Thinking of eventually getting a PC copy of this off of Steam. I like the mouse and keyboard movement a lot better for Doom games, and I play a lot of megawads on PC, anyway.
One thing that seems kind of janky is getting stuck on walls/fixtures/etc when moving around and trying to dodge projectiles. That, and movement feels kind of stiff while using some of the weapons, like the rocket launcher (probably due to the recoil). It's barely there, but it's noticeable. Stuff that I probably didn't even think about when playing it back in the day, since I didn't have any PC Doom games to compare it with. And man, I do miss the Revenants, Archviles, Spider Masterminds, and chaingunners (yes, even those annoying bastards).
But the graphics are fantastic. The designs on a lot of the level fixtures like walls, pillars, etc., are just awesome to look at. I really like how a lot of the levels are similar to fortresses/castles/etc. (one of my favorite things about a megawad called Eternal Doom released decades ago). Just a great atmosphere overall. The chaingun looks, sounds, and feels a lot better to use than its PC counterpart. The fully-upgraded Unmaker is really fun to use. A really fun game to finally replay after all these years, with the ability to save anywhere now. Thank god!