If Google uses the first few sentences of article and they aren't as good as summary, article will never be on page one, no matter how good the article might be.
sort by best latest
You can help the HubPages community highlight top quality content by ranking this answer up or down.
I had a summary, and they did not use it. That is what I mean by inconsistency.
I see what you mean. I've just noticed same thing with some of my hub. What I do, I use my main keyword in the first sentence of the hub. This way Google will see it, even if it doesn't use summary.