I picked it up for the wincest, but the blood relation was too thin to do anything for me. And they never acted as thought there was any sort of taboo, so it didn't really seem all that hot. Also, all the good parts were spoiled by the animated gifs that convinced me to watch it in the first place.
It took a surprisingly long time for me to get bored of it though; I'd wrapped up 16 episodes before it started to seem shitty, so I figured I'd finish it.
It was shit, but it was watchable shit, until all the cliché fillers started showing up, like token Engrish speaking American episode, hot springs episode, amusement park episode, etc. When it stuck with the plot, despite how airy that was, it was ok, but I hate the above mentioned overdone scenarios with a passion.