I agree and disagree a bit here. Overall his four year tenure here was a huge success. He inherited a team that wasn't even in the top 200 the season prior. His first year, the team jumped into top half of Division I of men's basketball. He then turned out a borderline top 50 in year 2 and top 25 team in years 3 and 4. If the level of play in those four years was repeated for multiple decades, Wolf Packs fans would have it pretty good.
Overall, yes, It is poor form and silly to be hyper-critical of him now. I wonder how many people who are hyper-critical of him now nearly worshipped him prior. However, I do think his refusal to accept a larger buyout can rightfully leave a sour taste. Season tickets sold out this season even with increased prices. Multiple games sold out over his final two years. The support he and his team received was great and boosters chipped in to make him the highest paid coach in the conference and were willing to keep it that way. The community did everything you could have asked. He could have acknowledged that and agreed to a contract with a larger buyout. While Nevada basketball probably benefitted more from Muss than Muss benefited from Nevada basketball it was in no way a one-sided relationship. A larger buyout would have been a nice gesture. I doubt $2 million was going to scare off any suitors. Just minor quibbles, he did a great job and revitalized the program. Parting ways at this juncture may actually be good for both parties.
This is where I am. Muss is an intense dude. Going off the amount of assistant coach turnover he had, I imagine he can wear on people pretty quickly. It may not have been best for long term success of a program (or even best for Muss) for him to be at the same place for much more than 4 years.
With that said, this hire is crucial. With the wrong hire, the team can tank and all positive momentum lost. I think the job is more desirable than it was 4 years ago. It might also be more desirable for possible recruits. There are a lot of good coaches, and I think the program has a much better chance of landing one than in years prior. Muss deserves credit for that.