The lack of quick weapon swapping really hurts.
There's plenty of Lost Soul or Pinky traps, where the room will just fill with them.
Good luck switching to the chainsaw or chaingun before you die if you had the shotgun equipped.
You gotta wait for it to reload, then wait for the very slow change, one weapon at a time, while eating unavoidable damage if you're pinned.
Makes a lot of surprise encounters just unfair.
There's definitely some better things about this port, but this alone makes EX better.
Another problem this game has always had is the quiet doors.
You can hear them closing, but unless you're right in front of it, you won't hear them opening.
This makes a lot of secrets stupid to find. Especially the ones where the switch is disguised.
In the old games, you examine something, and immediately hear that it did something.
In this one, nothing happens, and then several seconds later you'll hear that bad door closing sound effect.
Like the red key secret needed for the first Unmaker key.
Still a good game overall, but some simple updates could vastly improve it.