The argument should not be that the PELS don't have a system or run offensive sets.... What you will see if you watch enough of the videos is a team that lacks decisiveness and does not run their sets well enough that it's very obvious that they are well coached.
Monty may not be a bad coach but he's not as good as people want to believe. The personnel of this team is probably the biggest problem but there are coaching problems IMO.
It's not fair to compare to the spurs but I'm posting this to show the obvious difference between the two teams. Monty has had 5 years to put this team together now if we miss the playoffs by a lot he's going to get fired. Mainly for the problems we keep having on defense. Watch this video of the spurs. They are decisive, faster, more fluid, and you know what... That's coaching. Pop made them better and he'd do the same with this squad. Monty doesn't need to be pop but he needs to win and get more out of his players.
http://youtu.be/rQK8YUpRSsc