100% agree. They're not ugly (obviously), it's their "comic book style" models that look weird and not suited for this kind of stuff, and personally I really don't like it.
Also, in my opinion, Rivals characters feel like they were meant to be "lewded" (they know what happened with OW, they obviously want exactly that), so lewding them is not as much fun as lewding the hot but still relatively "innocent" OW characters, which are supposed to be sexy to look at, but I don't think they were meant to became what they became, so it feels more "taboo"... I don't know if I'm making sense here...