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.
Growing the Beard: The general consensus is that the part of season 1 garnered a lot of negative responses (possibly a form of Hype Backlash), but from about the 9th episode, the show seemed to be finding its voice and getting better reviews.
Moral Event Horizon: In-universe, Nicolette killing Hunter Bell was this for Yewll, who broke ties with her after that. Sending the Volge and trying to irradiate the town certainly weren't nice either, but the last straw, for Yewll, was killing Jarred the bartender to cover up the former. Yewll killed her to stop her from doing anything worse.
Datak's slaughter of the Spirit Riders
Nightmare Fuel: Datak's rage after killing the Spirit Riders is really disturbing. His spitting and inhuman hissing is very unsettling.
Special Effects Failure: Unusually for a show like this, with consistently good and creative special effects, the Castithan makeup can be spotty at times. Sometimes you can see where the pale makeup ends and the actors' actual skin color begins (usually around the neck).
Fridge Brilliance: If nothing else, because a game is being made along side it, there's likely some cross-contamination of digital assets.
On the other hand, some assets are show specific - the entirety of the mines in "Down where the Dead Men Go" save for the entrance itself, interior and exterior, were CG as seen here.
The Problem With Licensed Video Games: The game's launch was rife with bugs, server issues, and lack of content, getting mediocre reviews from critics as a result. Updates have alleviated the issue to some extent.