I'm another who was very disappointed to find that the level 2 seating in the south end of Stadium 2 is now reserved seating. I also heard this from both users in Stadium 2 and from other attendees we met while there.
Last level 2 south end was an exciting place to sit - packed to the gills w/excited fans at all times and full of energy. This year we weren't aware of the change and got into the section accidentally (blithely walked past usher while he was busy w/another couple) and sat down to enjoy a match. Then a very nice man sitting next to my wife said "You know those are reserved seats, right? You're welcome to use them for now, but if my friends come back you'll have to move." Talk about a shock! <eek> We stayed for a set or so and then left in advance when he got a text that his co-workers were going to be coming back to their seats.
So now with the best, shadiest seating on level 2 reserved, you get the typical frequent empty/wasted seats and more attendees in that area that are there because they got some nice tickets from their boss/client/biz associate, rather than because they are tennis nuts, and are doing more talking/drinking than watching.
I get that this is a money-making business decision, but that doesn't mean that I can't be disappointed.
Last year we spent two great days in front row/center seats in that section (right above the TV camera at the south end) and had, along w/all the other attendees, a raucous, wonderful time. As noted, the reduction in open seats on level 2 makes getting into the remaining GA/shaded seats on that level a very chancy thing.
Oh well...as usual there were some great dubs matches (which we like the best anyway) on the other courts, so we survived!
Oh, and I don't know if it was a "just us" issue, but overall we were also a bit underwhelmed by the line-up on Stadium 2 this year. So luckily, in a way, there were not a bunch of matches on 2 that we were hot to see.