Me too, the same goes for the Survivor missions. I love that we have so many options and maps to play with. Cause of this I have little bite sized chunks of Isolation such as a single survivor map that takes me no more than 3 to 15 minutes, and I can string 3 of them together in a more cinematic experience, play the endurance mode for a longer test of skill, play with Safe Haven if I'm feeling especially masochistic, choose one of the Nostromo maps if I'm feeling nostalgic, or play the campaign once in a while if I want the full dose. For me it's so versatile, from 3 minutes to like 10 hours of fulfilling segments of gameplay. No other completely singleplayer game has gotten me to give it 230+ hours of my life.