any good tutorial sites for terrible drawers to learn to draw ?

I think you can find soo many tutorials in both Google search and also in Youtube. Also in Davianart web site too. There are some cool drawing books you can buy from Amazon.com too.

If you meant Manga Drawings then try mangaraiders drawing workshops and Mangaraiders drawing tutorials. MangaRaiders forum is friendly community for Manga Artists and writers. If you like Manga drawing you will love it.

Deviant Art has thousands of drawing tutorials on all topics (:

Either you have the ability to draw or you don't. It's like singing, you could go to an instructor to try to get better, but if you don't have the talent for it, it's just a waste of time.

practice without sites imo

you can get tracing paper, and learn all about tracing technique if you want. it might help you learn fast. d: