Jamplay is considered to be Guitartricks competition. And most people say that Jamplay and Guitartricks are the two best sites out there, each with its own advantages.
But for your situation, you definitely chose the right site. Guitartricks is much better for beginners in my opinion, has a much more structured lesson plan, and you can choose which path you want to go down after the core learning (blues, country, or rock).
Which path do you think you'll choose when you get to the fork in the road?