Pros:
-New / refined FX,
-Good gore, particles, details and enhanced models/textures,
-Improved movement and navigation,
-1st person leg viewmodels,
-New animations,
-Keeping the vanilla feel,
-Actually makes the game feel modern but pixel-ish.

Cons:
-Easier than the OG,
-Not enough marines yelling "My ass is heavy",
-Lacks workshop / modding support.

Summary: 9/10
This and the RTX mod combined would make the perfect way to relive a classic. Great job, it's ridiculously good for such an old game, it reminds me of Brutal Doom. Only if it were possibly to add modding support.