First, in the past they had a lot of bad information on the site. Stuff that was specific to ie, stuff that was deprecated, etc.

They've mostly cleaned up their act as far as that stuff is concerned but the damage has already been done to their brand.

In addition to that some people see them as a bit scummy because they are not actually affiliated with the w3 in any way but have used a name that seems to convey that they are somehow more legitimate than they are.

And finally, between an amateurish layout and mdn being the superior resource there just isn't any reason for a developer to use w3schools. They still enjoy a high Google rank and new developers visit their site a lot. But most professionals skip past any w3schools links and go right to mdn for more comprehensive documentation.

We've recently started using Angular in our small shop.

From a front-end dev/designer's POV, it has been awesome.

It has allowed us to totally divorce view from content. We are now able to easily theme a large number of CMSs using API-First development.

Basically, get your CMS to spit out JSON. (https://www.drupal.org/project/services). Tell angular to pick up that JSON. Make your templates using node/angular-ish markup, and you've got total control over all front end coding.

No more learning the weird templating quirks of Drupal, or wondering where this bit of markup is generated from.

Allows us to easily throw our sites into phonegap builds and get ios and android apps out of it. All the while, we only need to maintain one source of data, markup and style. To use a buzzword, it is "device agnostic".