Flying with United was the worst flying experience of my life.
We had two cancellations that we weren't informed of until the last minute, plus delay after delay after delay. We did get a hotel and food comp once (though not without arguing about it for hours with various staff members who tried the 'not our fault' tactic even when we could prove multiple times that it was, in fact, their fault) and the hotel they chose was abysmal (dirty, far away from the airport, no English speaking staff, almost no shuttles to or from the airport, etc).
The registration/airport staff were incredibly rude from the get-go, even flat-out hateful, the redirected flight options were at best inconvenient while most were just laughable, and I'm sure I lost a decade of my life expectancy thanks to all the stress this airline caused me and my family (including my two children aged 2 and 3, which the airport staff were appallingly dismissive of).
Not only did my family and I have a horrific experience, I watched how the staff treated the other passengers as well, and it was no different. It seemed like every airport staff member had a 'God complex' and was exercising their tiniest bit of power over ordinary people who just wanted some information and to figure out how to solve their current problem of not being able to get where they needed to go.
I witnessed passengers getting yelled at by United staff; my husband and I were harassed by a United Airlines worker for opening our suitcase near the counter, although no one was around or in line at that time; and gate staff were just unnecessarily rude to people for no reason other than to satisfy their own superiority complexes.
Even though I would rather pay double than to fly with this sorry excuse for an airline ever again, there were two redeeming qualities that I should point out for fairness' sake: first, the staff that we directly dealt with onboard the flights were lovely (where were they and that level of service throughout this rest of this entire ordeal?), second, we didn't crash and die.