(I don't follow boy groups so here are some gg opinions)
Red Velvet:
- Irene is a pretty awkward dancer, there s a recent dance cover she did of Naughty Girl, and her facial expressions ... i feel like she's overthinking it too much

- Joy is a weak singer, when I heard sing that note in Umpah Umpah, I cringed seeing her neck tense up

- Seulgi has no stage presence to me and when people say she should have a solo career, i just don't see it ???

Twice:
- Chaeyeong is kind of useless, I don't see her appeal. Sure she's the best rapper, but that doesn't mean she's a good rapper and I actually prefer to listen to Dahyun rapping and Chae singing

Blackpink:

- Jisoo is not a good singer at all, she has a deep tone which is rare amongst all the high-pitched female idols but that doesn't automatically make her good

I'm just gonna stop at the big 3 since I don't want to make this long, but I've also noticed there are groups with members that don't stand out in any way and it's annoying - just get rid of those members!