While providing a very similar experience, what Rift has going for it is a smaller community.
At first, I could not help but laugh. There is context for the quote, sure, but it struck me as funny regardless to take what would normally be a negative quality (few people are playing your game) and spin it as a positive. Especially when it is an MMO one is talking about, where the whole idea is the “a lot of people” part.
It is undoubtedly true that an MMO “community,” such as it is, has an impact on one’s enjoyment of a game. I read threads like these on the Guild Wars 2 forums, and the sort of hyper-competitiveness inherent to the dungeon-running culture presented there makes me not want to bother at all. The people running these dungeons are getting them done in 20 minutes, whereas it will take me hours to get a similar level of competency all while I slow them down (assuming I am not kicked to begin with).
Incidentally, this is why you have LFD tools: there will always be abrasive social encounters when grouping with strangers, but at least with LFD you are not dependent on their goodwill to zone in at all. As long as you have reasonable expectations (i.e. not expect four strangers to wait while you soak up the atmosphere), you will be fine.
I believe that Keen is probably correct that Rift’s smaller community is a positive, assuming you are into that sort of thing. Fewer people means less of an audience for trolling, more reliance on social contacts to get things done, which probably all contributes to a Cheers-esque atmosphere. Or at least a “we’re in this foxhole together” atmosphere. So… yeah. The fewer people that like your MMO, the more you will like it. And the converse – the more popular your MMO gets, the less you enjoy it – is probably true for many as well.
All of which means you can never say bad things about hipsters ever again.