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Either the AP value of that post or the number of replies it recieves, or both. In general, the better tutorials actually do get a better AP value than the crap ones, and they usually recieve more replies as well.
A lot of discussion is created for certain tutorials that aren't necessarily indicative of the quality of the tutorial and the reception of APs doesn't necessarily indicate how good a tutorial is (especially if someone has done 4 tutorials and everyone gave APs on the first one).