To a lot of people hiking in the rain is a slog. But I love it. Learn to love it.
If it's hot out and raining, consider not wearing a shell at all. Enjoy the cool rain. Stash your warm layers in a dry bag inside your pack. You can wear the shell later to warm up if you get cold. You are wearing quick-dry synthetics after all, aren't you?
If it's cold out and raining, zip up the shell and relish the cool weather. It's harder to overheat, so you can hike harder instead.
If it's raining when you are sleeping, hope that your tent doesn't leak. And enjoy the sound of rain drops.
If your shoes and feet get wet... learn to live with it. I love to hike in a particularly wet area (the Adirondacks), so regardless of whether it is raining or you are simply stomping your way upstream a river, your feet will get wet. The advice of others here to wear mesh runners and let your feet dry off doesn't work here... by the time my shoes get remotely dry I end up having to traverse another stream. Wear Gore-Tex shoes, socks or neoprene socks to keep your feet warm if it's cold weather. Both will keep water away... for a while.