I’ve played G n’R multiple times on location as there are several on public display around London.
First time I played it, I walked off on the second ball. I had no idea what was going on and the inserts were worse than useless. I think I rated it ‘3’ on Pinside - i.e. total cr*p.
The next time I went to the same pinball club, the owner of the G n’R had read my discussion on PinballInfo/rating on Pinside and had printed out (and laminated) a rule sheet. It was incredibly kind of him and he was also kind enough to teach me the rules. I played several times. The inserts were still useless (they just flash constantly, so it’s hard to work out the gameplay state), but I kept cradling the ball and looking at the screen to work out what to do. At this point, I felt it was a better pin than all that so I increased the rating to about 6.
I’ve carried on playing it when I see it on location, as I do now know the rules, and my view is that it’s amazing if you’re a Guns and Roses fan. If you’re not one, and you value gameplay over light shows, then it’s an above average pin, but not an exceptional one. It’s not bad, obviously, but it is a standard ‘shoot several shots to qualify a mode, etc. etc.’ pin with a lot of multiballs and no real surprises. Gameplay-wise, it’s competing with many other mode-based pins from a multitude of eras as far back as The Addams Family, and it’s not really terribly exceptional among that group.
So, if you like the lights/band/lots of multiball, I’d definitely consider it. If you just want great mode-based gameplay, there are cheaper and likely better options.