Really easy to do, fun and cheap. Cons: Takes a lot of led out of your pencil,some people have a hard time but i never had a hard time 'good' is all in your head, you draw with feeling and put your own style, don't copy others.
you learn to see things in a different way and start developing your mind Cons: if someone is not very gifted at drawing they might become frustrated when others make it seem so simple and natural ... but everyone should keep in mind that drawing can be learnt by almost anyone
Producing a good drawing is extremely satisfying. Relatively cheap. Outlet for expression. Cons: It takes a lot of work to reach a 'good' level, especially if you don't have huge natural ability. Constantly comparing your own drawings to those of others. Getting inspired.