I'm a Vietnam War veteran, and use the VA system, now that I'm retired.  Used to be on Kaiser pre-retirement.

Personally, I haven't had a bad medical care  experience yet.  In general, the care had been quite good.  I like my doctor.  The nurses there are pretty.  ☺

However,  I have experienced annoying stuff, specifically an inconsistent phone answering system at the clinic that I frequent, i.e. the press "1" through "5" for ...routine, then subroutines; long waits; and full voicemail box incidents.  I've mentioned it to clinic staff, and I'll see if they fixed it when I schedule my next phydical.