Once you're onto the medium levels and beyond, you'll be cajoled into smack-talking the level designers and laughing like a drain when it all slots into place, as if you're exacting some strange form of revenge by solving their unseemly riddle. It's that kind of game.
With 25 crafty challenges to pick your way through, Hamlet... Is a fine way to while away a rainy Sunday. Play it after a John Walker retrospective for maximum wistfulness.
What's unavoidable is the fact that almost all of the problems that weigh Psychonauts down are borne out of the legacy that the platform genre itself has, and Double Fine - like so many other developers - has largely been unable to avoid falling into the same pitfalls of inconsistent level design and unwise difficulty spikes. Dammit.