How many episodes of Agents of Shield have you watched? If you are bored with it right now then you are not right in the head. This current season has been really entertaining.
I haven't watched much Flash, but Arrow isn't some teen drama. It's pretty good. It has it's silly moments, but really good.
Thanks for the thoughts on AOS season 3 as I have yet to see it, so I can't comment on it. I'm one of those guys who can't stand watching ANYTHING week to week, so I either wait for all series to come to Netflix, or I record the series and catch up towards the end. In the AOS case, I'm recording all the episodes and then plan on catching up right before Civil War comes out so that I can see the interplay between the show and the movie realtime.