I'm watching the show first (and enjoying it) and reading the comic book second.
I will probably hate the show if I read the comic book first, because I'll be sitting there, constantly making notes about how much they messed up, or getting pissed off when I notice they changed something. I want to appreciate the show for what it is and not pick several holes in it.
I'm not surprised this thread is rather divided on the show. There are some silly things, but I think we all still like the show in some capacity. Discouraging others, by saying we'll eventually feel like all the time we spent watching the show was wasted, is bullshit.
Using that logic, or lack thereof, you'll be disappointed with everything eventually eventually you won't be interested in it as much as you were before.