It's by no means perfect. There are startups at all levels so sometimes you feel like other groups are slacking when really they are just in a different place (or are actually slacking).
There is no penalty for failure. (penalty is the wrong word but you wouldn't want to wash out of YC--pg has anyone?) groups would just fall off.
I tweeted the other day that the monthly demo day was too frequent and I think that is true. I think they should have 2-3 a year. In the end, inclusion into 'physical' incubators/funding/press will be the measure of nReduce's success and TOO much exposure may be a bad thing.
The ui is crude but improving. Angel list was a mailing list at first wasn't it? Hard to criticize nReduce for the ui when their model is still being flushed out.
Anyway, it's been helpful for loads of groups and I see a place for it in a: nReduce -> physical incubator / angel list sort of place. HN is the same thing--a community of like minded folks who tend to help each other. nReduce is just trying to organize the process a bit...