Number one: The world has been sitting far too long without large doses of Mercadante. A passionate, brilliant melodist, Mercadantes' rousing works inspire the soul to dance and hum along if one can, since subtle intricacies surprise the listener and what seems to be a melodies' natural course, twists just enough "out of the box" to make it unique and surprizing. A Donizetti contemporary - he might be said to have been the edgier one. Bless them both, but do give Saverio his due.
Number two: This particular work, Maria Stuarda regina di... is a sublime highlights offerring. It is one of the best I've encountered, particularly in light of the full libretto with markings for the sung and unsung. It works, because the music is so varied and the story so simple. It works because the talented cast and conductor are devoted to rock-solid ensemble performance. The arias, duets, the trios, the choruses are often breathtaking and the performer's characters could not have been molded better by The Actors Studio.
Number three: Everyone calm down and realize, that all performances are not funded nor gifted with everyone or everything they need for the "Grand Affair" of making opera. So choices are made. "How can we best present with what we have", is a typical, noble reaction to the difficulties which surround many great performances. That's likely to have happened here - and - out of the spare, has come a ravishing Maria, thoroughly fulfilling and far superior to most opera recordings, let alone highlight renderings. All one has to do is listen to the dreadful mish-mash of ORs L'Esule di Granata Highlights to notice.
Get into this piece, libretto in hand and read along at first hearing. You will be bowled over - and of all things, at Mary Stuart's happy years. Who'd have thunk it? Bravo OR!