While this subject is old as fuck in general, I didn't see more recent one of similar discussion since around June 2012.
I can only really comprehend about three reasons as to why most people don't like riding in the rain, ie: it's wet (duh), it's cold and potentially more dangerous for a variety of reasons.
Obviously every one is entitled to "ride their own ride" but, aside from the mediocre temps we've been experiencing lately, as par for January, the rain really isn't so bad.
Personally, I use to hate it due to the half lid resulting in a numb face, and further more for the fact that I would get water in my eyes.
However, having a FF lid seems to solve both of those nuisances and the only issue now is cold hands (could be solved with heated grips of course) and visibility could be a bit better from the water on the face shield.
Why aren't you riding?