Nothing. Rain is nice and refreshing. The smell is clean and crisp (usually), and it makes everything seem clear. As for getting wet, it's not that bad. Unless you're wearing something nice. Then it might suck.
When it rains, it affects the air pressure. I'm very sensitive to changes in air pressure. So I get headaches mailed to me from Satan himself when it rains. And it makes everything smell funky.
Yeah, I don't really mind the getting wet part either, the smell is probably the worst part for me as well. I don't really mind the noise, unless it's when I'm trying to sleep, but even then it's not too bad.
I don't mind rain too much. But I hate the mosquitoes that come after the rain. Like if it rains and the next day while I'm waiting for my bus to come for school I get attacked by mosquitoes. It gets really annoying and I get really PO'd.
Very loud thunder, because it can get very annoying. Such as last night, there was this very loud thunder and it woke me up and it went on for a long time. Plus it scared the crap out of my dog :P
Thunder isn't really part of rain, sin't it? PLus, it's awesome. Well at least I think so.
What I don't like about rain is when it's not ending. And the smell of certain things after the rain, like wet dogs. Wet asphalt doesn't bother me at all though, I almost like it.
I do really enjoy short and heavy rainfall, of course lightning and thunder makes it even better. I also like rain when I'm feeling down, it's almost like a "I feel with you" from the sky.
I just don't enjoy it when it goes on for over a few days, not necessarily rain but generally the grey sky and so on. Too much is too much.
I love the rain, I like taking walks in the rain, watching the rain, and doing a lot of things in the rain. The only thing I dislike is when it damages stuff. Such as yesterday, there was a thunder storm and it was pouring so much it knocked down the power lines in my neighborhood and we didn't have any power for about four hours.