I think the difficulty scaling works great. The game itself is not a smooth difficulty curve but that would be a nearly impossible design task - after the first couple of scenarios you can tackle dozens of others in nearly any configuration (there are quest chains, but no guarantee of the order you will approach them), with between two and four characters that can be a subset of seventeen or so completely different classes at anywhere from level 1 to level 9. There are simply too many variables to guarantee a perfect fit. But between the placement/spawn scaling based on party size and the scenario level adjustment based on average party level, it works out reasonably close a lot of the time and a quick bump up or down allows tuning to your individual group’s needs. We have typically been running at plus a level lately, and it’s pretty solid.