These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Awesome Art: H. R. Giger does not disappoint with the characters and landscapes he designs.
Awesome Music: The main theme for Darkseed 2 is actually pretty good, keeping an eerie, haunting tone. Being that it was composed by Mark Morgan (of Fallout fame) this is hardly surprising.
Big Lipped Alligator Moment: Late in Darkseed 2, Mike gets interrogated by an FBI agent. The agent accuses him of being a killer, Mike punches him out after he pushes Mike's Berserk Button...and it never comes up again.
Designated Hero: In Darkseed 2, even though Mike is probably suffering from mental trauma, he is still difficult to sympathize with. He comes of as being whiny, childish, and astonishingly incompetent in several situations. He also becomes more and more of a Jerk Ass as the game progresses (dialogue options can amplify this), and makes a few questionable decisions throughout the game.
Franchise Original Sin: A few moments of silly dialogue, poor voice acting (in the CD port) and unintuitive gameplay are present in the first game but they don't distract from the haunting atmosphere and genuinely creepy story. The sequel on the other hand is so obsessed with making fun of Mike Dawson that it forgets to keep those flaws in check and thus takes a steep plunge in terms of quality.
Hilarious in Hindsight: Darkseed 2's plot twist is remarkably similar to a book that was later made into a popular movie. The plot twist is so famous that just naming the work tells you what it is. It's Fight Club. Jack is, apparently, just Mike's subconscious, the cooler person he wishes he could be. Or something.
Narm: The first game's cutscenes used hand-drawn graphics and were quite effective. That's more than can be said for the sequel's full motion videos.
The Behemoth in particular. With all the hype it gets about being able to destroy the world, you'd expect something more menacing than a giant snake with a skull for a head wearing a buzzsaw like a sombrero.
Strangely, the bad compression that goes on sometimes when people are talking ends up being this.
Porting Disaster: The original version of Darkseed was considered a very scary game with a good atmosphere despite the moon logic puzzles and Guide Dang It moments, thanks to the H. R. Giger art and a creepy soundtrack. The port to CD, however, suffered from audio issues and added Dull Surprise voice acting, which pretty much wrecked the atmosphere.
Revenge Fic: A lot of people suspect that Dark Seed 2 is this, due to just how vicious it is towards Mike Dawson.
Sequelitis: While there are some gameplay improvements, it's generally agreed that the sequel is a step down from the original in terms of story and atmosphere. Notable in that both games had about the same critical reception at the time of release.
So Bad, It's Good: Darkseed 2, mainly because of Mike's dialogue and some other bizarre elements.