I just wanted to throw my 2 cents in as I've written a few great reviews on G. I do agree that she's a bit of a germaphobe in that you have to take off your shoes right away and get sprayed with sanitizer, but I actually see that as a good thing as she's into hygiene. I feel better knowing I'm dealing with someone like that. Once that's out of the way then she does insist on a thorough shower (which again, I see as a good thing), and then the fun starts right away - at least for me.
As for waiting 5-10 minutes outside after you text that you've arrived, I don't see that as anything unusual either. That seems to almost always happen (especially for KG). Not waiting in the hotel lobby seems prudent since random guys lurking in the lobby multiple times a day for many days could draw some attention. She's very careful. To each his own, but I think it's better to deal with someone careful rather than not.
I think G is one of the hottest girls out there right now and I feel I've gotten great service. I used to be a huge Cherry fan and she was often described as chilly by others, but I was happy with her as well. As with any girl, YMMV.