If you are a "casual" anime fan, Yosuga no Sora is at the very least a current series you can "challenge" youself with, assuming you consider yourself to be decently open minded. You don't have to like it (heck as a whole I don't either) but it is something that you can take as an example of "edgy T.V. anime". It is definitely a debate starter when pondering what is acceptable for broadcast and also what makes a good story as well. Do incestuous themes completelu make the rest of the show's plot/message moot or not? Something to consider for yourself if you haven't watched much anime and are looking for something different.