I've only been here for a month, so I can only answer in the short term. And that's 100%. I had one hub that wasn't featured (it was a little barebones), so I made a few edits, re-submitted it, and it was featured the next day.
It seems to me that in the short term, a hub that is well written and includes a picture or video or two will get featured. Some of these have gotten very little traffic after the first few days, so I guess they may fall idle in the future; but I don't see any trouble getting hubs featured at the get go.