No, I'd pretty much lable it an opinion.
Here's why:
Casual folks tend to gravitate towards the auto's, while try-hards choose the most OP weapons exclusively. They do not use any other weapons (like the "scrub" AR, ect), because only these OP weapons (almost always some sort of precision weapon) are somehow the only "skillful" weapons in the game. These people tend to gravitate to the Slayer Pro and MLG playlists, including the folks who think they're MLG material when they're really not, which is most of them.
Since there are more casuals in Halo, or any game for that matter really, there will likely be more spray players. This forum is, like all forums, not truely representative of the game's population as a whole, since probably only 1-5% of the population even knows about it or cares enough to post.
Thus, since the majority of this game is populated by casuals who either aren't "good enough" to use the "skillful" weapons or even know there is a such a distinction, most are using the "Spray and Pray" weapon set.
Casuals drive this game, not the so called "pros".
Trust me, put in a "Spray and Pray" playlist, and the population would soar, along with the number of complaint threads bashing Halo 4 for being "noon friendly" by the "pro" crowd, even though the playlist doesn't even indirectly affect them.
A player after my own heart.