I didn't really weigh in a lot when he was here but he seemed to take a few shots at the Kings/Los Angeles after leaving, especially about the hockey culture (or lack thereof in his opinion) and that soured me on him a fair bit. Thoughts?
I think many soured on him after years of lying, but there are also a handful of blind loyalists who believed every word that came out of his mouth and would follow him to a lava pit, like Jim Jones and his flock of blind followers.
Among many of his lies were the way they handled contract negotiations with loyal players who were with the organization for many more years than Leiweke was around for. Him lying to fans that the Kings would be more competitive in spending money and acquiring talent after said failures at retaining their own free agents. Him lying when he said the Kings would "now be competitive" in pursuing talent after the salary cap was implemented.
Him pretty much forcing Jeremy Roenick onto the team (and Taylor pretty much admitted in an interview on FSW with Bob Miller that it was a PR move and not a hockey move). The blatant lies about the returns of Allison and Deadmarsh. After insulting Luc with a slap in the face offer and letting him go, they went ahead and signed Randy Robitaille. Great move Tim, you fooled us! Continuously wanting to add a "superstar" to the team without really having a plan to build a winner, his only interest was to spend as little as possible, just have one "star attraction" and sell tickets. Winning was secondary (until Lombardi came along).
He was a con man, and he was good at his job. Until he failed to deliver on his promises with other costly ventures that cost AEG a ton of money. They built an arena in Kansas City that doesn't house a sports franchise (and Leiweke promised that he'd deliver a team there, whoops). They spent money on developing a football stadium before they even had any interest or commitment from a team to move to LA, an incomplete plan that cost billions of dollars built on empty promises.
Oh and we can't forget how they continuously raised ticket prices "in order to remain competitive" in the NHL while the Kings were pretenders. Now it's different, and the organization finally turned around when Leiweke had his hands off and away from making team decisions. Let's also not forget how Lombardi was warned about how much control he would have upon joining the team. Thankfully Tim had other ventures to focus on, like Beckham and the Galaxy, that took his time away from ruining the Kings.