Who exactly claimed that Narrativist games are boring and/or unsatisfying in anything other than a personal "I don't like this" sort of way? I haven't seen anyone extrapolating their personal negative feelings to all players of such games, or suggest they'd be happier playing something else.
It is all personal (as in, just the poster posting) preference. Your "let's see how you like it" example makes no sense to me in the context of this thread.
This may be a side effect of online discussion, but the general belaboring of "there's no realism/verisimilitude unless maximal pre-definitions are happening" feels very assertive of reality. Like, I try hard not to go around saying that "conventional games are boring and slow" and stuff - I instead try very hard to draw a contrast with the specific elements of various narrativist systems I find engaging or that appealed to me. The constant refrain back is stuff like "well that's just not realistic, lol."