Yeah, from a musical perspective you are right! The similarities are in how they are perceived in their scene - to some extend, as I explained.So what I get from this thread is that my life was a lie. /s
But in all seriousness, as someone who has been learning to sing for the past year, it's extremely common for metal singers to have nasal voices. Just try to sing any Guns'N'Roses song or listen to how nasal Axl's voice is, especially when singing high notes. The trick is to transform that nasal voice from Minnie Mouse to M. Shadows and that is not as easy as it may seem.
That being said, hating on Nickelback is so 2005. I have listened to my fair share of Nickelback because they are a very easy band to consume. But comparing these two bands is...I mean it just shows that objectively, those people do not understand music. Nickelback and Avenged Sevenfold are not similar in what they sing...not by a long shot. But hey, I guess people still haven't moved on from the looks the guys had back in 2001.
I mean, as an F1 fan, people still haven't moved on from Sebastian Vettel hitting his teammate back in 2010, so I can't say I am surprised.
My 2c on the matter.
I think it's really funny. We musicians and metal enthusiasts think that we know and value music and so I am shaking my head when my mom tells me "how can you listen to this, it all sounds the same" while on the same time there are people out there that say "Oh yeah, A7x sounds just like Nickelback"