And think of it this way:
Merman's Broadway debut? Girl Crazy, in which she was a supporting role only a few songs.
Verdon's Broadway debut? (After assistant choreographing a show and performing in a revue), a role in Can-Can. Damn Yankees followed soon, but that type of role was not her Broadway debut.
Hell, even Sutton debuted as an understudy in Les Mis.
Even the legends have to start somewhere, and this is only Patina's starting point. I'd say her Broadway debut was better than any of the ones above. She gets a major lead in a huge show.
Sorry to be a broken record here, but it's so silly to bash a debut performance based on not living up to basically an entire career and legacy of some of the most famous Broadway performers of all time. Especially since you accuse the younger generation of not knowing these other performers, which is a completely false statement. Young people in theater know who Ethel Merman is, believe me.
"Art, in itself, is an attempt to bring order out of chaos."-Stephen Sondheim