It's truth. AC/DC are better than GNR in my own opinion. 
ONly band that is better than GNR though. Usually those who say all AC/DC sounds the same are the ones who don't listen to music enough.
I've listened to music every damn day since I turned 13 and could buy my own music. Before that I had to listen to my Dad's country&western and 50s music, so I dont think I fall into this category.
And those same three chords have proven to be very successful.
Its 2am, I'm tired and my minds a bit hazy but uh, Black Ice, wasn't that the same album that done better than Chinese Democracy!?
If GNR were more successful than AC/DC then they could at least match the sales or even just be a little bit lower than the Back In Black sales.
And AC/DC did step out from their usual, Rock N Roll Dream and Ride On for example.
Sales??? Is that really what decides it for you?
I am not a GNR fan because AFD sold 28 million or so copies or because GNR has sold over 100 million records, I am a fan because imo they are better than mainstream rock n roll bands. They didnt put out unmemorable records just for the sake of releasing records for a greedy record label.
I like AC/DC but I dont love them. I have seen them in concert and they put on a great show. I have Black Ice, its the best they have put out in many many years. But Guns N' Roses they are not, thats why I am on this forum talking about "Better" and not on an AC/DC forum somewhere discussing Rock N Roll Dream.
