The NXs performed well, with Enterprise doing some scouting that gave us some critical info about the Romulan military, and when the Battle of Denobula happened, Thunderchild anchored the battle line, dished out damage that destroyed a space station, two Warbirds and helped kill two more, all the while being battered (and surviving) by the enemy.
The Stingrays, OTOH, while they did their job in escorting the Thunderchild, were really outclassed by the Romulan Warbirds, so I agree to the sentiment that we need a replacement for the Stingray.
It can be either an Arrowhead or Half-Saucer, to finally give us a proper FG or DD.