I've heard good things about Destiny's seamless in/out online stuff. Now an Instagram video posted on Sony's feed explains how it works: no menus or fuss - if you see something you want to get involved in you just shoot it to join.
Seriously. Through a mixture of bad choices and terrible planning I'm making the bad guys stronger in Shadow Of Mordor. Sauron doesn't need to return, he just has to wait long enough for me to cock everything up.
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.