Ah yes!
But we aren't pronouncing anything here -- it's all written word, and in
written English, MMOG is still an acronym which stands there in place of Massively Multiplayer Online Game.
Regardless of how common it might be to pronounce the collection of letters as "an em-em-oh-gee" in order to avoid taking the time to speak each individual word, it does not change the meaning of those letters - which remains "a massively multiplayer online game".
Without knowing before hand that I'm
not going to come along and read each letter as an individual word, the author really has no choice but to properly construct the sentence according to the full meaning of the acronym.
In spoken English you can get away with all sorts of things people won't take the time to notice, and it
would be correct to precede an "em" sound with the word "an".. however it would also be
incorrect to proceed a "muh" sound (as in 'massively') by the word 'an' (I couldn't even manage it in that sentence for example).
And since we're dealing in written comm's here, I still maintain that since you can't know how people are going to come along and decide to
read your acronym, you are obligated to construct the sentence as if you had written it out completely in the first place..
/Duck Tapes seams on I'm the only one who gives a fuck filing cabinet as it is about to assplode
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GW: Tashen Boke [R/Me]; Rosti The Ninja [Mo/R]; Gort Grimley [W/Ne]
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I'm not even angry. I'm being so sincere right now, even though you broke my heart and killed me.