@EvelineClariss If we assume Sayaka to be bi there are no contradictions. As for her interactions with Kyouko, the developers know what the audience craves... They'll get around to it eventually.
^
Quality: pretty average for a Cute Girls Doing Cute Things series (I'd say it's a bit bellow Yuru Camp in terms of quality).
Yuri: fairly high
It also has a nice amount of science and not much fan service.