There's 600000 threads in Mining, which translates to about 500000 threads complaining about BFL, so to be realistic, you'd have to count all of those as 1.
That's what I like about BitcoinTalk's lack of antiduplication laws: you can figure out public sentiment just by counting how many threads there are on the same topic
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I like physical analogies to virtual things, so here's one. If we printed all of BitcoinTalk on paper, at a rate of 10 posts per page, there would be a stack of 341 thousand pages. At 0.1 mm per sheet, a stack of paper with BitcoinTalk posts on it would measure over 34 metres. This is higher than the Victoria Memorial Building in Ottawa, Canada!