The Plutonia Experiment

Yep. This is just exactly just more of Doom 2.

Yep. this is the same amateur\sequel\add-on style of level design of that era, with trolling, random riddles and giant unending levels. With the main idea being shoot more stuff coz shoot more stuff. Compared to base Doom 2 it is not even artistically coherent\correct and very gamey. Visually levels are pretty plain, uneventful and not memorable. And of course final boss would be an icon of sin which was bad even in the original. If you want just to play more levels for doom without regards to quality — it is for you.

TNT: Evilution

It starts very strong, with some new visuals and new music, but then it slows down at 2\5 mark to be as generic, trolly and poor as plutonia, after which it suddenly has a row of extremely short and plain levels. And overall Evilution is not thematically coherent, having you run around prisons, offices, warehouses, sewers and other boring real-life stuff. Though, sometimes you can find something truly amazing and great between them. Something which is very doom with all it's cultural zeitgeist and non-explicit references. Some parts are even surpassing both original Doom 2 and the Doom itself, some levels are legitimately artistically and technically great. And the final level is somewhat improved, with dumb puzzles, cyberdemon fight, and icon of sin (yes, again) being more combat heavy and sensible. I was on the verge of recommending it, but this release crashes in one place, and it doesn't display evilution text screens, instead it just uses plutonia ones, so you will never see the story of this add-on.

They tried so hard, and got so far, but in the end, it doesn't even matter. Some great stuff is spoiled with bad parts, after which it's ruined by the release, and on top of that there is the plutonia's dead weight.