Ironically so.
As in, "this library sounds really good", but it actually does on particular composition style and with a lot of hours spent learning the ins and outs of the library, its quirks, and tweaking the sound of each key.
Not that it's bad, but I kinda feel lost when I hear masterpieces and then I find what looks like a toy in my hands. Unless it's me who isn't good enough at listening demos in a critical way.
For instance, Spitfire Solo Strings with its "Virtuoso" patch looked great "out of the box" in the trailer video, with just a few automations for dynamics and vibrato. Still I'm not 100% sure it would be as easy as it seems in my hands.