Many news sites (e.g., TechCrunch) have been hyping WolframAlpha as a threat to Google, and it's natural that people are trying Google-style search queries. However, looking at the examples at the site (http://www.wolframalpha.com/examples ), it's clearly not intended as a direct competitor to Google, and it's not at all surprising that it doesn't perform so well on the Google-style queries people are trying. My first take is that it's more like learning Mathematica: you need to learn how to ask it the right sorts of questions, and the examples look like a useful way of learning to do that.
No doubt many of the news outlets who've been hyping WolframAlpha as a competitor to Google will now denounce it as having failed, when it wasn't meant as a competitor at all. It's the news sites which have failed.