Alright, let's finish this up...
E4M5: They Will Repent
98% kills, 2/2 secrets, 1 death
I always liked this map, especially for its interesting use of vertical space and ledges. The wide windows and being able to connect to multiple rooms is a nice callback to E1, as well. The texture scheme is a little bit bland, but not bad by any means. Playing on -fast, this is the breather map - usually only one hitscanner at a time, space between you and demons, and the lost souls are usually hidden down in trenches and can be safely taken out one at a time. Only thing I don't like is the design at the end, jumping through the window and missing a ledge forces you to miss the yellow key and BFG - gotta find the secret teleporter first (or be careful and land on a ledge).
E4M6: Against Thee Wickedly
98% kills, 2/3 secrets, ~15 deaths
I want to like this map, I really do. It's iconic in a sense, and has lots of cool ideas with the central teleporter, the cyberdemon finale, using the cards to open up multiple secrets, etc. Unfortunately, there's also a lot of frustrating aspects. First is the goddamn lava everywhere, with not enough radsuits. Playing this level on -fast is already painful enough with all the hitscanners and fireballs everywhere (and limited space to dodge) but adding unavoidable lava on that makes it a pain. I got stuck at a lot of spots because I was only at 15% health or lower and simply couldn't make it past the lava to the next objective, which is lame. I also don't know why the rightmost cage near the yellow skullkey is marked unblockable - maybe it's for the secret, or maybe it's just so that one goddamn cacodemon and just fly through the cage like air and fuck me in the ass. Also, this level reminded me how much I fucking hate cacodemons. Most IWAD levels so far put them in small, tiny corridors, but this level finally lets them fly freely around to fry my ass and use their bullshit infinite z-movement speed.
E4M7: And Hell Followed
100% kills, 2/4 secrets, 5 deaths
Another map I like. Definitely doesn't feel like an IWAD map, but instead a PWAD map made by someone who had time to really think about how to details maps (and sure enough, it is!) There's some nice lighting in the wooden hallways, and nice detailing with the texturing (I really like the combination of SUPPORT and the gargoyles faces). Some of the choices are a bit strange (the random techbase bits) but nothing too gaudy. Combat for most of the level isn't too bad, but the outside area was a nice challenge on -fast. My only real complaint is the goddamn instant-drop walls - especially on -fast, they're kinda bullshitty.
E4M8: Unto the Cruel
87% kills, 1/1 secret, 0 deaths
Another map with some nice looks. Probably my second favorite boss map overall behind E2M8, just because I like having some meat to the level before the final showdown (especially when the Mastermind is such a weakling). The amount of zombie meat at the start is pretty funny, and the rest is a decent romp. Nothing too dastardly though, even on -fast, and even if you don't come in super stocked from E4M7, the goodies here will stock you up. The final battle is a little tougher than E3's simply because of all the extra monsters, but also easier because of the infighting they create and the extra goodies in the area.