Is Reza’s play, in the end, a modern classic or a modish crowdpleaser?

the slavering cudden, propped upon his staff

Greeny-crackly. Fever-trees. Scalesome. Flailsome. Tusky. I was eight reading those words; I remember.

[T]hey were baffled by tears in moustached sixth-formers, by walls of impassivity in the Lower School, by silent conspiracies which nullified the rules.