I love the rain. If I didn't, both here in Japan and my 10 years in Oregon would have been miserable until now. Rain makes mountains mysterious. It makes the next rise or bend in the trail a surprise. It brings out creatures you wouldn't see otherwise. As a photographer it brings out the colors in things and guarantees an even, gentle light. It challenges me to understand my equipment and makes me appreciate being warm and dry, or sipping that hot coffee. It hushes things and gets you contemplative. It leaves the mountains more to yourself, so you can hear your own thoughts or arrive in camp and most likely no one else will be there. It makes the landscape move.
it even tests your convictions about the controversy over misting in silnylon, especially when you live in a place like Japan where rain often comes down so hard and so suddenly you're completely drenched before you can even get your rain jacket out of the pack.
Plus it makes you feel alive... I don't mean "full of pleasure", but alive, as in reacting to something, whether it's joy, anger, misery, boredom, lyricism and song, cursing, or delight. It always elicits something!