Maybe naively I took most of the more 'negative' comments as being tongue in cheek and wasn't expecting any response on here to them. However they do seem to have struck a nerve.
Back to the pandas. While behaviourally they don't compare, say to big cats, to a typical zoo goer, a sleeping animal is precisely that, a sleeping animal. Be it a lion, tiger, chimp, sheep, panda or whatever, it ain't that exciting. (Unless it's particularly close to a viewing area so closer observations than normal can be made).
In years gone by I made a trip to Edinburgh to see Mercedes, the first polar bear I'd clapped eyes on since distant memories of those at Dudley. Now this was a long journey and when I got there, lo and behold she was asleep in the middle of her compound. All day. That, to me was a let down, though in hindsight I don't know what I was expecting. On the flip side, I've also seen the koalas at Edinburgh and thought they were amazing. Even though the most energetic thing they did was something that may have been a sneeze.
I guess it depends on the expectations you go with as to how you come away from the day. If people expect to see big black and white balls of cute fluff curled up, they wont be disappointed. However, if they expect an all action exhibit that you can't take your eyes off it........maybe not.
Finally, my only prediction for the whole thing is that I think many people may be surprised by how small they are. Not that they're actually small, but I think tv does give the impression of a much larger animal.