Best: Beautiful Mikasa oval serving platter. It was an ex-boyfriend's coworker's wedding. I was shocked and they even gave one per person, not just per invite. We were young and had no need for them so we gave them to our mothers. Surprisingly, the wedding was very nice and not OTT as one would assume from the favor. Worst: Glass "LOVE" coasters. They sat in my car for a month then sat in my kitchen drawer for a few years till I finally threw them out. I felt bad at first and was SURE I'd use them eventually. Nope.
Best: Anything with food.
Worst: A mason jar for my drink and they didn't even have the lids that went with them. I like mason jars but really?
P.S. you can totally walk down the isles at goodwill and see exactly which wedding favors people don't like! We went to look for glass for a craft project and there were rows and rows of wine glasses with the bride and groom's name and wedding date (from all different weddings)
Best: delicious lemon tart that I drunkenly ate immediately; a little craftsman-style mini-lantern votive holder that still sits on my coffee table; a simple and pretty metal wine bottle stopper that we still use regularly.
Worst: A tiny cheap waxy candle shaped like a pear ("The perfect pear!" Hardy har!) (straight to garbage), a table runner that actually looks really expensive but not surprisingly does not match our dining room nor fit our table (still have because I would feel guilty throwing it away, but I will seriously never ever use it), a piece of paper I was supposed to plant in a garden somewhere and that would supposedly sprout wildflowers (straight to garbage).
Those are actually the only favors I can even remember. If no one else even had favors, I never even noticed.