I'm sure people are going to get butt hurt over this, but hey you asked. Kimbers in my opinion and MANY others are not good 1911's. They are low quality entry level pistols that have name recognition which people misconstrue for them being good guns.
First, I hope you like mim parts. Kimber uses them in EVERYTHING. They pioneered the use of mim parts but also cut so many corners they gave it a bad name. Sure, other companies use mim parts but of much higher quality than the junk kimber churns out.
I owned a Custom TLE/II at one point and it was a paperweight. I had fte/ftf right out of the box. I chalked this up to needing a break in, however more problems began to surface as time went on. Most noticeably the slide wouldn't fully return forward. At the time I knew nothing about 1911's (second gun, 21yrs old) so I didn't tear it down and diagnose. I did send it back and when it was returned Kimber sent a nice note saying everything was fine and it passed all their inspections "could not duplicate issue". BUT, the slide had much much more play in it; if you shook your hand you could hear the slide move. Knowing what I know now, either the slide or frame had a burr or was not fit properly and whatever they trimmed they took too much off. I can only speculate but that was my poor experience.
Recently I have inspected and tried to help some buddies (who didn't heed my warnings) with kimbers and they haven't gotten better. Barrel "fitment" is laughable, hammer hooks are having irregular or half contact, and overall just poor fitment.
If you are in the market for a 1911, about the lowest price point I would recommend is about $1000. That will get you a springfield operator which is light years beyond its kimber counterparts. I also would recommend skipping the TRP series as they are only marginally improved over the regular operators. Dan Wesson is without a doubt he BEST you can get in the $1500-$2000 range (excluding used custom guns). I don't know how they sell those things in that price range as its damn near a custom gun.
To ultimately answer your question, they have a bad name due to industry recognized poor quality control and corner cutting. But whats damaging is how consistent these negative issues are at surfacing.