I've been using Rocksmith 2014 to help learn guitar and bass. So far it's been great for keeping me motivated to practice, and the riff repeater is excellent for learning difficult phrases. I'd like to know which elements of the game are most helpful for music instruction, and how to set up the various options to optimize learning.
Here's an example of the kind of advice I'm looking for: The riff repeater works well as a kind of “super metronome.” To learn a difficult phrase, set the riff repeater difficulty to 100%, tolerance to None or Low, and speed repeats to 3. Start the speed slow – as low as 15% for very difficult passages. The game will automatically increase the speed when you can play the phrase perfectly three times in a row, just like you would do with a metronome. If the speed gets too fast, or your playing is too tense, back off the speed until you are comfortable enough to play perfectly without tension.
Please mention if any of the game modes or guitar arcade games are especially helpful, and why.
Note: This earlier question is related, but it emphasizes what's missing from Rockmith, rather than how best to use it.