I was talking a bit in the KBMOD Slack just a little bit ago about TV shows that I felt were underappreciated. I thought this might be a good forum topic that people could contribute to. I don't have a comprehensive list ready to go or anything, so I'll probably be replying to this thread when I think of new ones. I'll start things off with the list I had going in Slack:
Wet Hot American Summer (the TV show on Netflix)
I actually never saw the movie, but the show is fantastic, and has a shocking cast. It felt like there was a decent amount of hype behind the show when it aired (I think last year? maybe the year before?) but it has since fallen off people's radar it would seem. It's a pure comedy from what I remember, not much drama/action.
Dead of Summer
This one seemed to go completely missed by like 99.9999% of people on Earth. It only got one season which was unfortunate I think. I didn't fall in love with it after the first episode, but by the end of the season I was hooked. It's set at a summer camp in the 80s and it's basically like a horror movie in TV format. If you're into the whole "80s summer camp horror" vibe then this is definitely one to check out. This one is like a drama/suspense/horror (specifically put horror last in that list) with some light comedy elements.
You, Me, & The Apocalypse
This was a strange one. It was made in the UK (I'm pretty sure) but also aired on NBC here in the US. It barely received ANY promotion at all, which was a shame, and had Rob Lowe as a priest with a dirty mouth and a habit for alcohol and tobacco. Similar to Dead of Summer, this was cancelled after just one season (which was a HUGE shame because it ended on a crazy cliffhanger). It's really fucking funny and well made as well.
Ash vs Evil Dead
If you like blood and guts and one-liners this is the one for you. The show is hilarious, disgusting, and has Lucy fucking Lawless. Honestly Lucy Lawless is enough reason to watch the show, but everyone else is great in it. I have literally zero complaints about this show. In a lot of ways I think it's actually better than the movies. Also, @andrewsarchis recently started watching it and will confirm how great it is.
I think Humans is on its third season at this point and airs on AMC but for some reason still doesn't seem to get the attention it deserves. This is a pure sci-fi drama about robots who develop consciousness, and all the shit that comes with that (fear on the part of humans, fear on the part of the robots, etc). I'm not a huge fan of the teenage daughter or her brother, but aside from my minor complaints about those two particular characters it's darn near perfect. The cinematography is great and the music is god-tier thanks to Cristobal Tapia de Veer.
Dirk Gently's Holistic Detective Agency
This is the best fucking show of 2016 and you're a fucking idiot for not watching all of it twice. It's based on the Douglas Adams books (author of Hitchhiker's Guide) and has an incredible cast, amazing directing, unbelievable dialogue/writing, and (again) god-tier music thanks to Cristobal mother fucking Tapia de Veer. I rate this show HIGHER than Stranger Things. And I fucking LOVE Stranger Things. It's seriously in my top 10 best TV shows of all time and has already been renewed for a second season (filming in progress currently).
There are more shows that I'll add to this thread later, but I think these 6 are vastly different while being similarly great and totally underappreciated. If you get the chance to check out any of them DO IT. But mainly watch Dirk Gently. I swear to god you will hate yourself for waiting to watch Dirk Gently.