Exactly what 'causes' the missing files, whether bad uploads, bad servers, bad downloads, or 'take-downs', is always going to be a question.
'Back in the Day' (i.e., before back checking uploaders like JBinUp), and still today with a huge amount of traffic coming off the various PowerPost types, unless the uploader follows 'good practice' that part of the equation is still a goodly percentage of problems, and perhaps that's why the DVD (as opposed to BR/HD stuff) seems to have a larger 'total' share of problems (those BR/HD files are HUGE, and using older posting s/w is problematic, I know from personal experience).
The second part, the servers, has gotten to the point of near zero, at least the best ones. And D/L'ing has gotten very fast and very good as well, leaving the 'take-downs' the last part, perhaps the 'fills' server could help. But it appears that it takes a fair amount of figuring to really know for sure if something actually did.
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