Demon of the Well
Just finished Herian, the precursor to Herian 2. It's...pretty shoddy. Layouts are pretty poor, combat isn't that entertaining, and Ian Wilson takes all of the things people hate about Eternal Doom, throws in some more obfuscation, and dials it up to 11. It's reined back in the IWAD retools (from Doom, Doom II, Heretic, Hexen, and Strife). Incidentally, the IWAD retool maps are among my favorites of the set. Things get better toward the end but Herian should be reserved for historicists or people that really want to shoot Heretic monsters with the SSG. I admit, that part is very satisfying. Also check it out for the Spiderdemon replacement, a maulotaur with a chaingun mounted in his chest a la Wolf3D.
I agree on most counts (and I like Eternal Doom, myself), though I've never been a big fan of IWAD homages/remixes, and so even those don't score a lot of points with me. I would say that Herian 2 also ends up feeling more like a slog than a good time for many of its maps, although the hit/miss ratio is probably at least a little better there, largely by dint of an overall higher degree of craftsmanship on a technical level.
Apart from some recent single maps, I'm still revisiting 2002: A Doom Odyssey for the megawad club, and still making my way through Hell Awakened, which is really starting to grow on me. It really starts to hit its stride a few maps into the Hell episode....it's not always the most interesting thing in terms of structure (and the current version still has a couple of instances of missing textures and a few potentially gamebreaking progression oversights), but the author has a real gift for setting up suitably intense ambushes and set-piece battles.