The last bunch of years I have been disgusted with most amplified live concerts, even most rock concerts. Too bad, as I love listening to live music. But so much of it is poorly amplified and/or mixed I just get pissed off and either suffer through it (making faces and sometimes loud comments), or just leave. I think for two reasons: 1. I have become a more educated, discernable (a.k.a. snobbish) listener since acquiring a decent home rig and thus am far less tolerant of poor sound; and 2. the folks running the sound boards are either deaf, ignorant, or just don't care.
What I really hate is when a performance is amplified when there is absolutely no need. For example is smaller venues with acoustic instruments. Even if well done, I still hate it, knowing unamplified is best (when possible).
These days I much prefer my rig over most any live concert and often just stay home to listen.