The setting doesn't matter for me - I determine a severe letdown initially by how many game breaking bugs it has. If the intended path cannot be followed. If the game cannot be completed. Then I look at the gameplay, mechanics, engaging systems - if it is all repetitive or the solution is too simple, e.g. for a puzzle pick up A, slot it in B, press C, repeat; for combat stand still and spam A to win - then there is little engagement and no catharsis for completion.
Sometimes a pretty landscape is all that's needed for catharsis - there may be shit mechanics, but breathers in between sections and cool distance art will probably be all it takes to please me
