Summer was the main reason I initially tried this game (well, the Unity version, obviously) in the first place, and she is still my main goto character when looking for Rick and Morty porn (obviously I have a thing for "family" fun and sisters are a big one for me). Before this I was meh on Beth, and never even considered Morticia, or Tricia (I still don't really care for Jessica (or most side characters), as there is nothing really interesting about her character here or in the show). It's not just looks, but story and character for me.
I do agree Summer's personality isn't how I'd like to see her (yes, I know, what a weird thing for the person working on the game to say). But, again, as always I'm limited a lot by what Ferdafs is doing. At least for now, that is still her struggling with thinking she needs Ethan, and trying to pretend like she knows what she wants. I do try to downplay that as best I can, but I get what I get, and don't want to change things so much as to be unusable for future scenes.
At some point (soon) I hope we do get rid of Ethan and Summer can move on to a more interesting story arc.