I used to think I hated anime but I started to realize I have very specific tastes.
I find that I tend to prefer darker stuff but without exaggerated art styles, so stuff like Cowboy Bebop, Death Note, Berserk, and Akira appeal to me way more than the usual anime that gets popular. I guess I prefer the more "serious" art style because it's easier for me to get invested when characters aren't morphing or developing exaggerated features when they're emotional (that sharp teeth with elongated mouths especially annoys me). I remember trying to watch Fullmetal Alchemist and got turned off by the sheer goofiness of the animation, and I tried watching because of that dog-girl thing I kept hearing.
There are exceptions of course; I love Bobobo-bo Bo-bobo to the point it's one of my favorites, and what I saw of Trigun was pretty good (never did finish it). I dunno, I guess I want more of that specific type of anime but it doesn't seem to get much attention.
Guess I can't recommend
Majin Tantei Nougami Neuro because it's got a goofy look to it, but it's about a demon who eats mysteries (you know who the killer is, but the fun is figuring out
how the crime was committed) and is played by the sexy Takehito Koyasu. I like the design of Neuro, makes me think of Yami Yugi but if he was a legit demon who eats people's souls.
But for dark anime, while I can't think of any off the top of my head, judging by your
Metalocalypse avatar, you should try out
Detroit Metal City. Yeah, it has the animation style you're not a fan of, but it's a black comedy. It's
supposed to look goofy as the nice milquetoast guy turns into the rape demon death metal vocalist whose manager creams herself over the depravity of it all.
Bobobo is unique, I honestly can't think of another anime like it, but
Samurai Pizza Cats had a similar approach to the dubbing process. But that's an acquired taste tbh.
Everyone should watch
Monster. Its widely considered one of the best animes ever made (if not the best). It is a lot however, and it is about 70+ episodes, which is very rare for a modern anime to run that long. But its basically identical to the manga.
EDIT:
I also fucking LOVE its opening:
https://youtube.com/watch?v=n86hgIXc1BM
Still is a huge crime to all of humanity that Viz dropped the license.
Also just a hint to those who are going to watch it, don't skip the end credits.
Barring marathons, I just don't get why people skip end credits in anime, but yeah, never-ever-ever-ever skip
Monster's credits.