Y'know, I was a pretty big Carlin fan, I had a few of his albums and even saw him live in concert once. I listened to the whole thing while driving, and I thought this was okay. It's obviously not George Carlin, but it sounded a lot like him, and I can imagine he would approve of many of the jokes. It wasn't a laugh-a-minute, but I did get lost in it a couple of times and forget that it wasn't really him, and I did laugh out loud a few times as well. (The joke about the best comedian for AI being Bill Cosby got me!)
Carlin's comedy was very topical, which doesn't always translate to today, so having new, up-to-date Carlin bits are actually cool. I can understand his daughter's apprehension, but at least people are talking about her dad again, so I would think that's a good thing.