Others on the easy page get have 25% solve rates and are two stars, there is no consistency.
This isn´t even that bad taking into account black has a checkmate available so you know you have to keep white in check (or make him lose his checkmate somewhere).

I solved it and rated it three stars because once you figure out the first move, the next five moves follow naturally. If the puzzle started one move later, this would be just two stars. If it required more than one tricky move, I would have called it 4 stars.

with both rich_sposato and fezzik