I wasn't initially convinced by Evolve. It's a great idea but struck me more as a co-op add on like COD Extinction. Now I've played it though and I'm sold. It's a great co-op shooter. Here are my thoughts on why, and a video interview with Turtle Rock co-founder/design director Chris Ashton featuring new gameplay.
Oh God, he's just there: gently rocking back and forth whenever I close my eyes. There's no explanation behind this at all. Just a sad VHS tinged loop that's going to give me nightmares. Trust me, it's far worse as a moving GIF.