Who rates, or how do the songs get rated for difficuly on Guitar Tricks Mike?

Looking at it from almost 12 months in, I'd rate that solo harder than a 2 too Mike. Factor in the arpeggiation of the second electric and from my expectation perspective of a 2, the only thing ranking the song overall possibly a 3 rather than a 4 -because there's no 3½, is the easiness offered by the relaxed tempo. OTOH, no question the rhythm to me is and easy 2, a doddle at that tempo.

No disrespect -sincerely- intended to Dave C whether the song tutorials are auto ranked or instructor ranked, but he does a lesson of a [u]very[/u] famous song with rhythm and lead adapted to single guitar rated on GT at just 3 guitars ...which clips along at an intense 150BPM and has an (original) signature idiosyncratic structure and so needs to be committed both mentally and muscle memory rote at that speed! o.O

Then I did some research and realised just how incredibly accomplished a guitarist Dave C is which rationalised his (?) assignment of a 3 instead of a 4 or more. WOW! I learnt a lot persevering with that song. Frustrating as it was, my motivation was easily maintained because I loved it so. And still do. If the tempo were even just 120BPM, it'd be so much easier to play. At 150BPM, it's still fun as to play, but definitely a "take no prisoners!" tune at my stage.