I don't buy into the hype for this as much as some other people, namely those who hail it as the greatest megawad of the modern era. Regardless, I think it has an undeniable quality, particularly in the visual department. This game is undeniably gorgeous, with each chapter's style feeling distinct and lived in. In this sense, I think the texture pack is the highlight of this megawad. Unfortunately, I don't vibe with Dragonfly's level design as much as some others, as I find his combat setpieces a little bland. It's certainly not bad, I just don't think it justifies all the hype. Still, Eviternity is a uniquely grand adventure that no Doom fan should miss.
...Oh yeah, and Dehydration can get bent. Dropping an hour long map as the penultimate level in a random chapter is seriously not cool.