I also find it hard to believe that you couldn't find any answers to your questions in past posts but here goes.
1. What foods and meals have worked out really well for you and your friends?
First time - we brought a bunch of Tasty Bites as per recommended highly here. Hated them, ate once and gave the rest away. Second time - we ordered a bunch of our favorite meals from restaurants / fast food places 2 weeks before and froze everything, then reheated on our tiny one burner stove on the playa. We had hardly any leftovers. Also, pre-cooked bacon - HOLLA! So what does this teach you? That it all comes down to personal tastes and preferences. What works for some doesn't work for others.
What stores well/keeps well/is something you still wanted to eat once you're out there.
See above. Also things like pop-tarts and frozen mini quiches were great to have. Easy to thaw, hardly any clean up.
2. What did NOT WORK? What food/meal was just an abject failure?
What didn't keep/store well or was just stomach turning in the playa environment?
See above. Also - do NOT bring raw meats (this is emphasized a thousand times on Eplaya.) There is nothing worse than the smell of raw meats degenerating in the sun.
3. What did the playa make you crave? What did you wish you have, or what was a something that you loved that someone else did food-wise?
I would never have dreamed that a bucket of fried chicken would taste soooo good in the desert. First time on the playa, I was craving the saltiness of fried chicken. Second year - froze about 10 pieces of KFC which we defrosted, ate, and happily shared with several passersby who thought they had died and gone to heaven.
This is just my personal tastes and some of you would scoff, some of you would agree. Which is the whole point of what a thousand threads here tell you.
By the way - I was craving soft ice cream, and stumbled upon a camp that served soft ice cream. Oh my god, one of the highlights of the week. Another afternoon I was craving hot dogs. And I came upon a camp with a bunch of guys from Fallon, NV who were busy grilling up hundreds of hot dogs to give away to people. Another night it was 2 am, walking home in the dark, thirsty - and someone handed me a bottled water. Two minutes later, a guy approached us, said he was grilling up turkey legs, and handed us a giant dinosaur of a turkey leg. So this just goes to show you that while you can't rely on other people GIVING you food, it happens often enough to make ya smile.