My nightmare from Friday: I was dropping off in downtown Hartford, and I could've easily just gotten on the highway and gone right home. But I wanted to get a ride headed towards my town, so I set the destination filter. I get a ride very close to where I am dropping off - 15 minute trip, so it sound great. The girls get in my car and I start the trip, and it turns out to be a short 3 mile trip through rush hour traffic IN THE EXACT OPPOSITE DIRECTION FROM MY HOME. I grit my teeth and did the trip, and I got another ride request at the same location as I was dropping off. Perfect! The destination filter is still active. But I've just been burned, so as soon as I see the passengers, I start the trip, and it's ANOTHER rush hour trip going in the wrong direction. I drove off and cancelled. Of course, Uber sends me the exact same trip right away. Then I get another short ride request that wouldn't have gotten me anywhere, which I ignored. Finally I got a 15 minute trip, but this time I messaged the guy and asked where he was going. Luckily this time the trip was headed in the right direction.
Seems like the DF is just a suggestion to Uber, and that they will keep giving you regular trips that can go anywhere, even when you want to go in a certain direction.