Admittedly I only saw a couple episodes in the first season but I would think AoS would have had to have one of the most epic turn arounds in TV history to be better then Arrow or FLASH is. I just felt un-thrilled with what I saw even if I am open to the possibility it has become great.
Flash is the best CBM tv show for me, on network tv at least. Nothing beats Daredevil right not but Flash is a close second, it is a bit unfair to compare the two though as DD has much more freedom with the shows direction and how brutal or dark they could go.
Back to Flash, I like it that the show isn't afraid to throw almost any villains and heroes in there and that Flash isn't just running around in a red leather jacket being dubbed the blur.
I truly believe that's where other show fails, you advertise a comic book film, we want to see known characters with superpowers and in costume.
Agents of Shield was pretty bad the first season because it really lacked and superpowers, it also didn't help that it was scheduled with the movie timelines.
Daredevil is fantastic, but it's hard to compare it to FLASH. Both exceed in what they set out to do and I am thankful that we are getting well made comic based tv shows from all ranges of tone. Both the fun and sometimes "silly" and the dark and gritty. Just as it should be and is with the comic medium itself.