I'll throw in my 2 cents. I also agree with Carmine. I am rather 'undisciplined' myself. :) I've really only focused on learning songs, but learning them correctly requires I master various techniques along the way.

To me this is more fun (and more productive in my perception) than being machine-accurate with blistering speed over scales & modes. Those things come naturally as you work on your songs. (not that I am in any way machine accurate or blistering! :eek: but progress in that direction takes place almost no matter what else I do. ie: All of your efforts will contribute to your abilities.)

The thing is to make sure it stays fun. Unless you are somehow enslaved to a music career, if it stops being fun, then you will probably quit. I'll check my speed adn accuracy with a few runs, scales & whatever, but I don't spend a lot of time on them. I picked up a guitar to play, not exercise! :)