No, this is not good by any stretch. First 25 levels feel like they are all the same - colorless, flat, dull and bland. Next 3 look like deathmatch arenas with a handful of monsters. Again, all pretty much the same. The last two are pitch black mazes - oh what fun. As for the secret levels - I abandoned both. Map31 is a maze alternating between pitch darkness and flashing primary colours and map 32 is simply an incomprehensible mess. Possibly acceptable if you just want to kill some time with mindless point and shoot, but not what I would call an enjoyable Doom experience. At least it avoids degenerating into slaughter.
I rarely quit a wad in disgust, but this one did it. It was pushing a 5 star experience, but then the slaughter stupid started ~map19 and only got worse. It's not clever, not amusing and absolutely not entertaining. It ruined an otherwise good wad and left a very sour taste. Why do mappers do this? Played on HNTR and it really was that bad.
I have a real blast while playing this megawad. Think that Quake is not brown enough? You will get the ultimate browness here. I think that, beside the simplistic ugliness of it, it gives a good cohesive look to all the maps. And this one are really big and fun to explore. The ideas of cities, fortresses, islands, canyons and caves, and finaly tech base on moon, are really neat and some looks really good.
The story of the wad is pretty good, too. I love the liberties that the author takes while doing this mapset. As i played a lot and i found this kind of ideas in a few wads along the way.
What i didn't like it much, is that there wasn't other skies than the episode one sky from Doom 2. Again, i think it is that way for a cohesive storytelling, but anyway, it would be cool to feel the sense of time in the maps with different skies and shadows deploying in differents ways along the maps.
This could be the Eternal Doom of doom stock textures, but the linearity of the maps, aside from the somewhat empty but interesting areas to explore, departs slighty from the formula, and there are not soo much details as one might expect from a mapset like this. Don't get fooled by that, even with the somewhat Heretic-like linearity, the maps are fun, gorgeous in its brownway and pretty challenging.
I recommend this megawad to anyone that likes to explore and have a challenge in the vein of the best of team TNT mapsets.