Actually, I don't mind Fascination
It's not a good
episode by any means, but as you say, it's vibrant, colourful, has a genuine atmosphere of cultural festivity that's otherwise non-existant in Trek, and it's light-heartedly silly rather than unintentionally silly. Other than the O'Brien plot which is actually serious and effective enough (and it's nice to see realistic mundane character problems once in a while), this is a deliberately foolish episode, and it's okay overall. Rather "meh", but enjoyable enough, different enough to be memorable without overstaying its welcome by pretending to be meaningful when it isn't.
So you get a stay of execution this time, TGB
. We are amused.