What anime do you think is underated?

Pretear.

Boogiepop Phantom

I know that it became very popular with its release at the time, but after it faded, Serial Experiments Lain doesn't even have a fandom that we fans can call home...

Since Lain was taken, then Texhnolyze. Definitely Texhnolyze.
It's one of those anime that I just can't exactly describe through words. The meaning, the story, I personally loved it. That's probably to be expected from ABe.
However, I have only ever seen ONE person mention it out of the blue on the internet at all. There is absolutely no fandom for this anime, and it needs some credit.

Psychic Detective Yakumo is really underrated. I don't know if it's the kinda silly sounding name, the seemingly overused plot, or dark animation/color style. But this anime moved me so much. I've seen a power like Yakumo's before in other anime (being able to see ghost) but my goodness does this anime dive deep into his backstory and why he does what he does. It also has one of the WORST villains ever! Very rarely do you see a villain that has no redeeming qualities whatsoever. And the paradox this anime leaves you with over "him" is amazing. And my god the symbolism in this anime.... Love!

I learned so much from this anime. It has one of the deepest messages of walking away from what others think you should be or what you think you are "destined" for and forming your own path. For it only having 13 episodes, it has a lot to offer.

Note: Music can be loud so turn down volume. Oh and the singer is Daisuke Ono (voice actor of Yakumo and Sebastian from Black Butler)

Oregairu.

I believe Toriko

Nura Rise of the Yokai Clan

Hidamari Sketch. Little to nobody knows what it is. ;n; ;n; ;n; ;n; ;n; ;n; ;n; ;n; ;n; ;n; ;n; ;n;

Aria the Animation.

Detective Acadamy Q. I kid you not, there is no fandom. A handful of people even know about this show, at least in the U.S. I literally NEVER hear about it. And why not? It's a great show! Yeah, the art is older and the characters aren't ground-breaking, but it's a really good take on murder mysteries. It never got a dub licence or a continuation, so that makes me think both the U.S. and Japan are ignoring it, but again, why? The characters are likable and the mysteries are actually really good. Come on, people! Help build a fandom that should have existed 11 years ago.

Petshop of Horrors!!

Special A

Kyoukai no Rinne, I think it was released around 2009-2010 yet it doesn't have an English dub and I've never anyone on the internet talk about it