Is this site any good??

I agree with what Red 9 said. I've never paid for any art lessons and I've improved greatly just from the advice you get free of charge on this website! If you want to pay for art lessons, go to a local community college or art gallery, they usually offer drawing and painting classes. Having real-life interaction with the instructor and other students would probably be more beneficial than just downloading instructions off a website.

Go to a class near you so you can have some interaction with someone. Plus some good personal one on one learning from a good teacher will be worth the time and the money.