Good news, Willy. I reported the overinflated monster count on Discord, not that they are always difficult (in fact, in some levels, like WGS1, WGS4 or WGAlien, it's pretty managable), but it can get tedious to play the neverending respawn waves.
I haven't played the whole shebang so far, but from my experience, the reworked WGSpace 2 and WG Knee Deep are standing out of the bunch. WGS2 absolutely needed the new area, and the new textures are amazing. I honestly hope more will come with them. Alien X for example literally asks for it. While it's a very old map, and it blatantly copies Fusion Station with some so-so texturing, yet, the whole vibe of the level is pretty high, somehow it's more memorable than some others on the pack.
As for WG Knee Deep, while it doesn't truly belongs to the episode, it's an amazing map. I don't throw this word too often, but I loved it. Great atmosphere and brilliant in how it merges all the Hangar and Nuclear Plant set pieces in such an abstract TROR heaven. This map urges me to check your other stuff in WG Mega pack.
EDIT: WGS2 has 2 pigs left.