UA I really don't think is a terrible airline/company, it's their fleet that needs work. I say fire whomever is in charge of their fleet management. They think getting rid of 757/767's and replacing them with CRJ-200's is a fantastic idea (I personally know many routes that used to have these aircraft replaced with fifty seaters). AA and DL also have them but realize bigger = better. UA I know is getting rid of them but they think replacing larger aircraft for RJ's on high yield markets is a good business decision (when it's not). They also feel like these RJ's should have substandard service compared to the same plane/operating airline with Delta Connection/American Eagle. I sincerely think if they could fly E170's JFK-LAX or down to the Caribbean they could. I also want to fire whomever thought it was a great idea to replace A319/A320 seats (which sometimes fly cross country flights) with literally roller coaster vehicle seats.
TL;DR While UA might not be as bad as people make them out to be, their fleet is terrible and they need to fire whomever is in charge of it.