this may not be completely relevant to the first question, but i for one really enjoy the rocksmith experience. i have a shelf of music/tab that i mess with from time to time, and i too check out justin and the other youtubers offering online instruction.
the biggest thing i find with RS is that it's ready when i am. i don't have to search for videos or dig out tab. it seems my schedule any more is a few minutes here and there, with the only block of time later in the evening when everyone else in the house is going to bed. i can plug in the earplugs and hammer away. i also like the ability to see feedback on my playing.
i've come to the realization that i may never be able to play on my own, so i try to enjoy every minute i get to play at all. kinda like life in general, you can go through fighting it or enjoying it, all in how you look at it. i do know after being on this site for a while there is a ton of talent out there. makes me wish i was better, but also pushes me to try harder.