I personally found Singapore charming when I was there. It's a fascinating mix of several different cultures who all seem to retained many of their traditional customs. I never understood the sterile critique myself, the city never struck me as such. Gibson's main critique, from what I can tell, is the lack of much of a counterculture similar to what you'd find in the U.S. allied-bloc (Europe, U.S., Canada, Japan, So…
Gibson didn't look hard enough; there was definitely counterculture in Singapore at the time he wrote the story. A bit lazy on his part, but he's not a trained journalist. And there still is one now, although much less so than in the 90s.
The vibe I got from my time there is that most Singaporeans who are counterculture-inclined just leave for larger countries, in the same way a bohemian-inclined Swiss person might move to, say, New York or Berlin.
The larger problem Singapore has is that there's very little space for the arts in general, let alone counterculture.