How they could've ruined such a wonderful thing is beyond anyone's imagination. Season 1 was magnificent, with an addictive plot, great character development and a slow unveiling of what's to come.
Season 2 was so so but slow, and take any 20 minute segment in Season 3 you understand the show has gotten unbearable. They don't explain a damn thing and the plot is too convoluted to care. Instead you see how the writers using their now totally uninteresting storyline as an excuse to make all the good guys become the bad guys and vice versa. Do this enough times and you're going to loose an audience. It's like trying to keep a child with ADD interested with flashy magic. The little side adventures with the vortex guy or mind controller guy were completely uninteresting.
There are many flaws with the script, but off the top of my head here's one: They build up Adam as this super powerful/influential guy and beside the healing ability they don't even explain how, and then he gets easily killed to make room for the next big villain.
Cancellation is coming soon! Quit while you guys made some money.