One of the biggest scandals in Norwegian health care at the moment is a botched transition to Epic in one of the biggest university hospitals. Doctor dissatisfaction has gone to the roof at the point where 50% of the doctors are considering quitting.
Maybe they are different versions, or I'm an outlier, but I love epic - I used a relatively new build of the software last year for a new months, just the ability to message other staff in the context of a patient's chart saved huge amounts of time and interruptions. They also had this super low friction way of addending to the chart, so you could, say, review a (paper) ECG and start recording your interpretation straight into the correct chart within a second or two, and be done in around 10 seconds (with dicatation software which is usually from a different company but integrated)
I know many people that have worked on their integration teams, and could not imagine having to deal with what they do.
https://en.wikipedia.org/wiki/MUMPS