Just take a deep breath and remember this is a vacation, you're supposed to enjoy yourself! Just pick a few places and take a chance - you'll get good and bad reviews on just about every restaurant at WDW, you could really go crazy worrying about it.
I like the idea of picking out of a hat - adventurous, whimsical, and then you can blame it on fate if you don't like it!!
FWIW, at MK there aren't many choices - if you have kids, we really enjoyed Crystal Palace. At Epcot, I'm not sure you can go wrong too many places. We enjoy Biergarten for the atmosphere (oompah band and BIG mugs of beer), but are looking forward to trying Le Cellier this trip.
When we plan our ADR's we always try to pick a few favorites, and then a few new places to try. And after we book, we stop reading reviews, menus, etc., and just go with the flow...