Here are some things people do not talk about with Karl that Nuggets fans see all the time.
He finds one or two pets every year, usually a veteran that is somewhat smart hustle player, he then proceeds to overplay that guy to the point of being a liability (you think Casey was bad with Alan Anderson?). This year those guys were Andre Miller and Corey Brewer, before that it was Anthony Carter and Melvin Ely, prior to that it was Dayntay Jones and Anthony Carter, prior to that Greg Buckner and Eduardo Najera, even before that it was Earl Boykins and those were just in his time in Denver
now I am not saying those players did not deserve some kind of minutes, but Karl goes to the extreme, and ignores their mistakes and problems while hold young players and stars to much higher standards.
he refuses to develop young players, Kenneth Faried only got minutes when Nene & Mozgov were out injured (when Nene got back Faried went back to the bench which is one of the reasons Nene was traded), Evan Fournier finally got a chance when Gallo & Chandler were down and was the best 3 point shooter on the team (he was arguably a top 3 player for the Nuggets in the last 3 weeks of the season, yet when he fouled Curry twice in the lane 5 minutes into game 2 his minutes were slashed to almost nothing), Jordan Hamilton has been a very good scorer off the bench yet Karl decided he made too many rookie mistakes in his 2nd year and sent him back to the bench. It is also not just a problem he has had with the Nuggets, we are talking about a guy that only played Michael redd a total of 35 minutes his rookie year (the reason reportedly was that the Bucks already had a 3 point shooter in Allen).
Everywhere karl has coached he has feuded with and ran off all star talent. Carmelo Anthony, Kenyon Martin, Ray Allen, Gary Payton, Shawn Kemp, JR Smith, and those are just the ones I can remember off the top of my head. Veteran rotation players love Karl, guys with all star talent all grow to hate him pretty quickly due to his double standard, Stars must give 100% maximum effort at all times if the start making mistakes they are benched, veteran role players on the other hand are allowed to stay on the court to work through their problems.
In 2008 Chauncey Billups was traded to the Nuggets one of his 1st comments was that the Nuggets did not have an offense only a couple of plays, in fact he had to design their inbounds plays as the Nuggets did not have a single inbounds play. that's right the Nuggets whole offensive and inbounds scheme consisted of 2 plays.
Even today the Nuggets offense is 2 plays, the drive and kick and the lob. They do not run a set offense, in fact Karl brags about the offense being a simple offense where players must either drive or shoot 3s. No back screens, no or the ball screens of movement, no coordinated pick and rolls. Nope just get the ball and immediately pass, shoot, or drive unless you are Karl's pet, then it is pound the ball until you decide to do something. You want to see something really sad, you should see how that offense works when a team goes to the zone, go watch the warriors series, even in the playoffs the Nuggets could not figure out what to do against the zone.
That is not even getting into defense, the Nuggets have 3 of the best wing defenders in the league, (look up synergy stats on Gallo, Chandler, and Igoudala), their only deficiency is against spot up shooters. Why because karl's defense consists of constant switching and collapsing the paint. Meaning the PGs are often trying to guard big men and the bigs are trying to cover guards, leaving the SG/SFs to try to help on defense. that is the main reason the Nuggets are always near the bottom of the ranking for 3 point percentage allowed.
For all the hype Karl gets, he has always coached teams with more then enough talent, yet they constantly underachieve, it has been going on for 20 + years, sure they make the playoffs, but considering the talent he has had they should have done more then that.