I would actually say the opposite. The only arena I saw Jovi was Lodon's O2 and I thought the sound was very underwhelming. I got used to it as the shows went by but the initial impression was that Jon sounded like chipmunk and Richie's sound during solos were all over the place. People here were bitching about the sound quality in Hyde Park, but the next day after Jovi I saw McCartney there and I thought the sound was awesome in comparison. Also, a year later when i was in London again, I went to see Iron Maiden in the same arena and I thought the sound wasn't very good either, so I guess it's the venue thing, which I find surprising, considering how it's now one of the most popular arenas in the world and it's still rather new, that they wouldn't figure the sound properly. I also saw Jovi in a stadium show in Vienna and I thought the sound was great. That's why I general prefer either big outdoor shows, or very small intimate 2,000 capatity arenas. Those 10,000-20,000 arenas I find the worst in terms of sound.

As far as their streams go, I would agree with you (it's beyond me how much they butchered the Lisbon show, where Jon was firing on all cylinders, yet Obie somehow made him sound so much worse than audience videos in YouTube), however, I thought the Cleveland stream sound quality (and mixing) was very solid for a live stream. David was too low in the end, but for most of the show, everything was fine.