Ermione was a complete flop when it was first written, possibly because it lacked a happy ending (something that was still something of a novelty at the time), or possibly because Rossini seems to have been trying harder than usual to stretch what could be done with the standard forms of opera of the day. Certainly it isn't because the music is poor or uninteresting. This is one of my favourite Rossini operas.
It was rediscovered in the 90s, and produced in a number of theatres, but the problems with staging it today are considerable. Not only is the soprano lead a massive, and massively demanding, role, but it requires not one but two lead 'Rossini-style' coloratura tenors, plus two other lesser coloratura tenor roles with a fair amount to sing in ensembles. The singing here is remarkably good, considering the difficulties of casting this opera. The conducting is lively and keeps up the interest.
The production is one of those (and there were lots in the 1990s) where the action takes place inside a theatre on a sloping stage. The costumes appear to be loosely 1860s (why? The opera was written in the 1810s). The actions of the characters fit the music reasonably well (there are no extraneous fish or Popes wandering about the stage), but still the production tends to intrude.