In my case, I distinctly remember lots of articles along the lines of "if you are still using a relational database then you are dumb", and arguments that gravitated towards "Integrity? Why would you want that, when all data is trivial either way?" (hyperbole added by me, of course). The "Mongo DB Is Web Scale" video was funny because, parody aside, it reflected the feeling at the moment.
Assertions like that (perhaps not officially by the devs, but certainly from the community) gained MongoDB the reputation of "pretentious" you mention, IMHO.
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In my case, I distinctly remember lots of articles along the lines of "if you are still using a relational database then you are dumb", and arguments that gravitated towards "Integrity? Why would you want that, when all data is trivial either way?" (hyperbole added by me, of course). The "Mongo DB Is Web Scale" video was funny because, parody aside, it reflected the feeling at the moment.
Assertions like that (perhaps not officially by the devs, but certainly from the community) gained MongoDB the reputation of "pretentious" you mention, IMHO.