I've been an instructor here for over 8 years ... so hopefully I don't sound biased.
Quite honestly, even though I kinda work here by providing lessons... I haven't found any other site on the net that is as dedicated, honest and fully committed to providing top quality lessons to help everybody from beginner to advanced guitarists. I don't wanna sound like a cheezy advertisement...but I've received thousands of emails congratulating Guitar Tricks for the way they not only present lessons, but help guitarists after the fact by answering email questions. Not just emailing back, but providing additional videos, TABS and descriptions and other additional help without any limits whatsoever.