The stimulus wasn't intended to "improve the economy," it was intended to PREVENT a full-blown depression. The only "improvement" was to pull it out of its death spiral. And the idea that there has been "very little economic improvement" since the stimulus is ridiculous. The economy isn't good now, but it's exponentially better than it was in early 2009.
The intent of the article, at least for me, was not to say that all 50 of those are even legit accomplishments, it was to challenge the notion posted by someone else that Obama had zero accomplishments. That's simply asinine.