I don't have a lot of complaints. Flying is almost always way faster and cheaper than driving.
There are rude people of course. Fat people who think they own 2 seats. Etc. Normal annoying people stuff you find anywhere.
I like window seats. I like to be able to watch the landscape below - it's a view most don't appreciate. I know I am in the minority on this.
I have only had one flight cancelled, my daughters and I had to spend the night in Dallas that time (about 6 or 7 years ago) and fly out the next day. But this winter, the flight cancellations have been extreme. My wife got stuck overnight in Denver right before Xmas. Yes, the weather was not good, but it was still handled terribly by the airlines. My parents just spent 5 days stuck in Mcallen, TX. Were supposed to fly out Monday of last week, connecting to Dallas then to Omaha. Yes, bad ice problems in Dallas, but 5 days worth? They weren't alone, some people opted to not get hotel rooms and spent the week sleeping/staying in the airport.
My parents finally got to Omaha 2am Saturday morning. So it took over 5 days worth of hours for them to leave Mcallen and get to Omaha. Ridiculous. I would be beyond pissed if that happened to me, and probably just rented a vehicle one way to drive back to Omaha. But they were kept on a string with promises/hope each following day they would get to fly out, so they waited as each day passed by. Sat in the airport each day waiting hopefully, while flights were cancelled each day, then having to get a taxi back and get another expensive hotel room each night. I get the ice storm was bad, but planes fly out in northern airports in similar conditions all the time.
Airlines seem to give less of a crap about their customers more and more.