Well I have had the game for years and always had a guitar. I never got serious and really got into it. Now I am 62 and retired so I have time to learn. I will recommend the arcade games also, especially the scale games, string skip and ducks redux. Also it may get a little boring but after a lot of playing around in and out of Rocksmith (a lot of learn a song and riff repeater) I just started doing the lessons in Rocksmith. I started at the top and plan to do every one to 100% I am really looking foreward to getting a little better and playing around with session mode.
I have had a lot of people tell me over the years that Rocksmith is just a game and you will not learn anything. I beg to differ! I look at Rocksmith as a very good learning tool. The biggest thing that Rocksmith taught me was that there is a whole lot more to learn outside of Rocksmith. I also have a subscription to Guitar Tricks and frequent Justingutiar.