A significant amount of what is written on the Internet seems to cater to the extremes of opinion. Therefore it can often be difficult to find something rational, well thought out and considered. This makes analysis of subjects very difficult because there is no moderate voice or that voice gets drowned out by the extremists.
A second issue is that a good many articles online that profess to be teaching something cite no sources whatsoever. As a lawyer I find it very difficult to move past that, and even if the content seems good, I'll immediately be put off using that source to learn from.