Just got back from a very wet and muddy and fun mountain bike ride in the rain. Only 6-8 miles I think, and just under an hour. Which was enough, for today.
I think I'm going to go 1x9 for my drivetrain, so I only used middle ring, to make sure I'm not crazy to do this. Seems like it should work out- I'll suffer a bit on hills occasionally, but it'll be great 95% of the time.