I'd have to say that it's due to the polls.
Now that there're polls, many people don't bother to post even a short note, feeling that clicking in their vote is sufficient to express their opinion on the matter. Even when people do rouse themselves enough to make a feeble attempt at a post, the majority of discussion generated by a poll tends to be about either how the poll was badly designed/should've included more options, limited to the choices presented in the poll, or expressions of preferences/dislikes for multiple options. The scope of discussion has consequently become extremely narrow, and comparitively uninteresting.
Floods of off-topic posts would be a close second IMO.
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