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Many people are arguing the literal English wording of the term MMORPG. Personally i don't think genre labels are literal, and i think they are just convenient labels for a group of games.
Don't believe me? I think it would be fun to go to some "MMORPG" sites and see how things are categorized.
First up ... MMORPG.com. If you click on "game list", it will say "MMORPG Gamelist - All MMO Games". What is listed under this big MMORPG game list? Amongst others ... we have
Diablo 3, LoL, DDO, the first GW, Vindictus, World of Tanks .. and many that either don't focus on, or have no "massive" MP gameplay.
How about whatmmorpg.com? (http://www.whatmmorpg.com/fantasy-mmorpg-games.php)
LoL is listed under Fantasy MMORPG Games. Mechwarrior Online is listed under sci-fi MMORPGs, right above Eve. There are other non-massive MMOs there, you can find the other listings yourself.
How about mmobomb.com? http://www.mmobomb.com/top-10-free-mmorpg
DDO, and NWO, and Vindictus are on their top 10 list. Other non-massive MMOs are listed .. you can go look at their whole listing.
I suspect very few, even those managing MMO websites care very much about the strict definition of the word "massive" in the label "MMORPG". The term is used quite loosely, if LoL, Diablo, vindictus, DDO and NWO are counted.