I've always liked Red Velvet's songs but only recently really became a reveluv. I know they're known for their vocals - especially Wendy Seulgi and Joy but I would occasionally stumble upon folks who say Irene can't sing/is only there for her looks and that Yeri adds nothing. But I find that the 5 part harmony really makes their sound. Yeri is the backbone of some of their best songs. And even though they can't do the gymnastics Wendy and Seulgi do, they can hold their own. For eg. I was surprised to hear Irene sing Candy on her own or just impromptu sing along to Wendy's parts to stuff and sound just as good. They should let her sing in her higher register more.
Tl;dr: who are some of the underrated or overlooked vocalists in your fave boy or girl groups?