Oh yeah no you're not alone. I think 99% of the viewers agree.

A term to define someone with a super powerful voice but doesn't dance. I think Mercedes calls herself that at one point.

(I also wanna just say that this is not my opinion. Amber Riley is a fucking goddess and the writers poorly wrote Mercedes character)

Narratively (and this is talked about a few times in the show) Mercedes is a "park and bark" while Rachel is a "triple threat" but also Rachel simply wants it more.

However, make no mistake that Rachel is absolutely unbearable and a terrible character.

I just heard this discussion on a podcast. Blue is always raspberry.