What anime do you think the attention they get don't simply do justice? I often see that popular anime like Kimetsu no Yaiba, Boku no Hero Academia and Naruto get more and more popular among the otaku while the underrated anime keep being drowned in sea of anime. For me, what I think are underrated:
• Grand Blue/Baka to Test, in term of comedy
• Shinryaku! Ika Musume, in term of slice of life
• Gakkou Gurashi, in term of foreshadowing, plot-wise, horrow-wise and in zombie-category
• Tonari no Kyuuketsuki-san, in term of kawaii
• Beelzebub, in term of shounen
• Kuma Bear/Shinchou Yuusha, in term of isekai
• Grand Blue/Baka to Test, in term of comedy
• Shinryaku! Ika Musume, in term of slice of life
• Gakkou Gurashi, in term of foreshadowing, plot-wise, horrow-wise and in zombie-category
• Tonari no Kyuuketsuki-san, in term of kawaii
• Beelzebub, in term of shounen
• Kuma Bear/Shinchou Yuusha, in term of isekai