Hmm, there must be a few... Lemme check my MAL. Also, I'm only gonna list the type of animes I most often see on the forum, but there are a couple more.
Death Note (really good plot)
Ergo Proxy (I really liked the vibe)
Psycho-Pass (mostly the first season)
Yuu☆Yuu☆Hakusho (perfect in every way imo)
Zankyou no Terror (except for that annoying girl, it was pretty much flawless)
Edit: oh, juts now noticed the long running series part. Dunno how I missed it. Anywaaaaay.