If CHristian Borle is phoning it in, just because Laura is gone, that is completely unprofessional and I hope that's not the reason . An actor should never let personal issues interfere with his performance.
The UPS guy is essentially scripted to receive large cheers. He gets his own entrance music and struts across the stage to it...any audience would cheer for that. That being said, I haven't heard anything good about Ven, but I'll reserve judgment for when I finally see him. I will say that i don't think anyone will ever come close to Andy Karl, but I'm biased.
As far as Matthew Risch as Warner, I was impressed by him. Vocally, he sounds a lot like Richard which isn't something I expected and I enjoyed his take on Warner, but I don't think he has enough arrogance in places and of course, RIchard looks the part more so. Once again, I'm biased :-P
"Less Of A Marilyn, More Of A Jackie"
www.richardhblake.com