Ok, I just played through the whole thing.
Some things I liked:
Map design - The first few maps were alright, but the quality certainly increased as I progressed through it (sort of like mine, heh). I like the Hexen 2 textures, especially in their own color instead of butchered by the Hexen palette
Gameplay - It was challenging in places, but nothing I couldn't easily handle. The ammo balance was good too, though there were a couple of times where I had to use me melee, but that may have been because I used the wraithverge a bit too often. Those chaos wyverns were a pain though.
Some things I didn't like:
In a few maps, the decorations (stalagmites, trees, etc.) got in the way and made it somewhat annoying at times to walk around, and has resulted in my death on more than one occasion as I tried to dodge something and three rocks were in the way.
The new weapon is HIGHLY overpowered. I saved my shots, not really knowing how much ammo for it was out there, and when it came time to fight Korax's second form, two or three shots from the thing was all that was required to kill him. He didn't even get a shot off.
The vampires can only shoot horizontally. Not up or down. If they're at the top of the stairs and you're on the bottom, you will never get hit because all of their shots will pass harmlessly over your head.
Switch hunts. I was never very fond of switch hunts, but there's a few places where it goes a bit overboard. For instance, in one place, there's a switch close to a door. When you press it, you sort of expect it to open. Nope. It opens a door on the other side of the map in a completely unrelated area, though you wouldn't know it at first because there's no indication which door opened. I go all the way there and press the switch in that room, and THAT switch opens the door where the first switch was.
A couple of the puzzles seem kind of odd, and the flame mask being right next to the puzzle spot didn't make much sense, especially since it lowers when you defeat the avatar. Instead, the door should just open, since that's what the flame mask is used for anyway.
Map 4's (temple of water) music. While I have no problem with the music itself, it's a little distracting (especially as it loops), and doesn't seem to fit that map.
Anyway, it was a good wad overall, and even though there were technically 2 hubs, it was more like 4. And once I got used to the instant killing lava, it wasn't so bad. It might as well be more deep pits, with all of the sudden stop at the end and none of the falling.