After spending 36 hours in DIA (Denver Intl Airport) due to a spring snowstorm that shut down the entire airport, I will never again fly United if I can help it and DIA (United's major western hub) is to be avoided at all costs.
The most demoralizing thing in the world is to wake up from a night sleeping on the airport floor and watch freshly scrubbed local customers board the plane that you could not fly out of town the night before. That's right: United dumped all (paid, booked) passengers from our previous night's canceled flight on standby.
Want to feel a real kick in the nuts? Walk up to a departure gate and ask how many passengers are wait-listed to your home town...Ans: 99.
The only way we escaped DIA in a relatively short period of time was due to my wife's "constructive confrontation" with a United ticketing agent.