The problem is that the internet encourages laziness in research and writing. It's very hard to verify sources of information, grammar and spelling is poor and rumours spread very quickly. Websites also tend to use data from other websites, thus spreading factual errors (see all the cheat websites).
While paper-based magazines are not error-free, I tend to trust their writing much more, as they are often closer to the source and much more care has been put into their production.
Paper-based writers are usually professionals, while internet writers tend to be people who do it in their spare time. Of course, when it's correct internet reporting is more timely.