I do not know what you think but for me there is more to the anime scene than the usual mainstream shōnen animes. Here a list that I'll edit step by step (every time a new gem come to my mind) about less known anime that are really good, some of them are actually masterpieces! I have selected them using story, background, theme, soudtrack, animation, characters' depth as parameters:
SOOTHE AND RELAX ZONE
Barakamon
Gin no Saji
Moyashimon
FANTASY and MMORPG RELATED
Hai to Gensou no Grimgar
Re:Zero kara Hajimeru Isekai Seikatsu
FANTASY and NORSE FOLKLORE
Sanzoku no Musume Ronja
Hakumei to Mikochi (manga)
EPIC
Akatsuki no Yona
Arslan Senki (TV)
COMMEDY
Danshi Koukousei no Nichijou
Feel free to add more.
SOOTHE AND RELAX ZONE
Barakamon
Gin no Saji
Moyashimon
FANTASY and MMORPG RELATED
Hai to Gensou no Grimgar
Re:Zero kara Hajimeru Isekai Seikatsu
FANTASY and NORSE FOLKLORE
Sanzoku no Musume Ronja
Hakumei to Mikochi (manga)
EPIC
Akatsuki no Yona
Arslan Senki (TV)
COMMEDY
Danshi Koukousei no Nichijou
Feel free to add more.