There are many things that irrrrritate me when I see some of the crap that has been installed, too many things to list as I am sure ya'll know. When my oldest boy was first getting into being my helper, I told him to do the best job he could do and not to be satisfied unless he was willing to put his name on his work (figuratively of course). After he started to get some experience, he would point out things, like sloppy conduit bending or pipe runs, etc. that he would see whenever we were somewhere that the ceilings were open. Don't get me wrong, I am not perfect by any stretch of the imagination nor is he but both of us try to do a quality job. So IMO you do the best that you can and don't worry about what the other guy has done. You can't change them. As the Beatle song went (for those of you old enough to remember who they were--ha ha ha) "Just sing obla-di-bla-da life goes on bra la la la life goes on!"
Man, now I have to break out my turntable and throw that vinyl on.....
And that as they say is my 2 cents worth.