The only thing I don't like about subreddits on Reddit is that someone owns them. No one gets to choose who is in charge of your favorite subreddit. There are power trips, coups, and all kinds of immature stuff that can go on even in relatively small and niche subreddits. On Hubski, everyone is the curator of a tag. You can moderate by muting and blocking users to clean up a given tag space. There are no owners or mods of tags who control what the rules are. While I have doubts about how the tag system will scale against a subreddit style system, that's not really my concern. That's up to MK and the gang to figure out. In the meantime, Hubski works just great for what it is. Also, I noticed you are asking a lot of questions about Reddit and comparing it to Hubski. A lot of people here use BOTH Reddit and Hubski for many various reasons. You don't have to pick just one. :)