Hope springs eternal. I check them all out, in hopes. But they always fail to live up to that hope. Not sure why.
My best guess is that the Marvel shows cost a lot more per episode than the DC shows, and a lot of viewers don't care as much about quality. It could be that purely business-wise, the DC shows make more bang for their buck than the Marvel ones. That being said, I still find them hard to watch. The fight scenes in Arrow, for example, just seem so much more obviously choreographed than the ones in Agents of Shield. Of course, all TV fights are choreographed, but it shouldn't be so obvious. Some of the Arrow brawls are like dances and you can just see the guys waiting for their cue like "sweep foot left on the third beat, wait two beats, and punch right".