Read the article completely. If you want to write an insightful critique of a technology article, you must read and comprehend all of the content. If you write a critique based on "skimming" the article, or if you write a reactionary critique based on the first few sentences of an article, you're setting yourself up for failure. Such methods will produce an incomplete or inaccurate critique that can be easily counter-criticized by someone who has read and processed the information in its entirety.
Understand the technology being discussed. If you try to criticize a technology article without any understanding of the technology itself, your viewpoint is not going to be interesting or useful to anybody. The validity of any critique is rooted in specific facts, and specific facts require specific knowledge. Research may be needed if the article deals with new technology. (And if you're simply not familiar with the technological field being written about, ask yourself why you're writing a critique of the article in the first place.)
Outline your critique and organize your thoughts. The simplest way to create an outline for a critique of an article is to follow the chronology of the original article point-by-point. But if you don't have any useful insight into a certain point in the article, simply skip it in your critique. Don't feel obligated to comment on or rebuke every single point in the article. Doing so can actually reduce your credibility by making it seem that you are simply "out to get" the author of the article. Forcing yourself to come up with a criticism of every aspect of the article will also dilute your criticism, drawing attention away from your more valid points and ultimately reducing your critique's overall impact.
Draft your critique using specific data wherever possible. Personal opinions have no place in a mature criticism of a technology or science article. If your critique is in the form of a rebuttal, the rebuking must be done through facts and figures, not name-calling or assumptions. If you cannot back up a contrary opinion with hard data, your critique will be reduced to a libelous rant.
Refine your critique by conforming it to APA guidelines. APA is the standard style guide for science and technology writing (see Resources).
Have your critique reviewed by a friend or colleague. Just as technology and science papers need to be peer-reviewed before they can be published in a journal, your critique should be reviewed by a technology-minded peer before you post or publish it.