They're going to have new record attendances in Bulgaria, Romania, Slovakia, Portugal and probably in France too (we always forget about Lyon). They haven't overstimated anything. Some venues will be more empty than others, mostly because there weren't smaller alternatives (Romania and Italy, for example). Where they've flopped (not strictly talking about sales) is Knebworth, but considering they're going to keep basically every penny they will make on those days it will still be an economic success.
North America is kind of meh if you look at the few shows and the support package, but let's not forget for example that they're going to have 30k+ in Montreal (last time our beloved Metallica had 27k), they've sold 40k+ for LA in a matter of minutes (last time they barely sold 12k tickets) and San Antonio will probably be their biggest single US headline show.
South America is a bummer, but:
- Bogota was bound to do way worse than last time, plus the venue sucks and the prices are sky high.
- Lima and Quito will have double the attendances of their last visits.
- Buenos Aires' total will be around 84k tickets sold.
- They've sold at least 55k tickets in Chile in one day (unless the first show is already sold out for real).
The only real pity is Sao Paulo, since the third show doesn't seem likely anymore. But we're in full holiday period, with tickets offices closed and people having to spend a fortune on everything else. Could still be that it will pick up later (it took way longer to sell out the first show last time).
So I don't get all the "poor sales" comments about this tour. Only one is (probably) going to be very bad, the rest will go from okay to amazing.