I'm not saying I hate co-op -- in fact, I love co-op -- but in MMOs and shooters with more expansive maps/areas to explore and fight in, I've always enjoyed being less of 'one of the guys (and/or girls)' and preferred skirting the edges of the map; using guerilla tactics. Less concerned with being a hero; instead, being a silent guardian; a watchful protector... A dark...
You get it. But I think with the 'background matchmaking,' or whatever they called it, it's going to be even more fun to play as a lone wolf and come across other people in the middle of a huge firefight, or struggling in a mission, and being able to appear out of nowhere and help them out.
I find that concept equally exciting as exploring and adventuring through the worlds with friends who have my back.
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I've also played defiance and for all its faults it is a game that has created an environment of as it's been called "natural co-op." I'm really hoping Destiny is like that just with improved story telling and UI. I feel kinda weird leading a group but like stumbling upon events already in motion with a clear goal, help those dudes and destroy those guys. For me I have my own plans and like to wander/explore at my leisure on my own time and group up when I feel like it.