I don't use a mic. I tried all the raids, VoG and CE I was able to complete, but it wasn't easy.
IMO, there's not enough content to justify playing if you're only comfortable with SP stuff. I love solo exploring/grinding as - as you rightly said - the gameplay loop is superb and I agree it's absolutely the best FPS experience to date, but I also play a lot with friends, Crucible, Raids, etc...
I'd imagine if I was only interested in the solo stuff the gameplay loop wouldn't be enough to support it for long.
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Another thing:
I really wish they'd add a text and voice channel to the social spaces. MMOs aren't just games, they're social interaction clients. I used to spend hours just hanging around talking to random people in the MMOs I played, which was an excellent way to find new teammates for activities.
At the least I'd love to see proximity voice comms in the tower and the wild.
For a game so centred around the social, the lack of direct communication is bizarre.