If you ever learnt an instrument as a child or have been a parent of a child learning an instrument, you know that practice is not always an automatic love of the learner. Even if your goal is to be the next greatest superstar it is still hard to find motivation to practice at times. Especially when you're plateauing!
Yousician may not increase the rate of mega guitar stars pumping out of our loungeroom factories but it will definitely make learning a bit more engaging and perhaps speed up that early learning.
I have played guitar now for over 20 years and I am enjoying the free version on an almost nightly basis. In some ways it's the perfect game for me, it combines my love of guitar with the challenge of a game situation.