I work part time in the box office there. On the first day of ticket onsale, this lady comes to my window "wow, the lineup this year really sucks!"...and then proceeds to buy tickets for like 10 shows...it must not have sucked that bad.
I think the draw of Wolftrap for a lot of people is the venue. Its a great place to spend a summer evening, having a beer outdoors listening to music. And i've only been shushed there once, and it was during an NSO performance...which, you know, you really shouldn't be running your mouth during anyways.