If I understand you correctly, I agree. There might be some elements with regards to the riffs that IF writes, but just because there are some traces doesn't make it completely nu-metal.
Yeah, borrowing elements is completely fine. It's just like video games. I don't care if a feature has been in another game, if it's awesome and makes the game so much smoother or enjoyable I WANT them to copy it. Imagine if Diablo 3 had not included auto pickup of gold because Torchlight did it earlier. Same with other features.
I don't mind Cloud Connected starting and ending with a synth that could be in any nu metal song, it adds colour to the song (something old IF lacks) and in between it's just a great ol' IF stuff.
Nu metal was pretty much a bunch of teens breaking the barriers of music, once again. Every generation has them and they usually remembered as legends. Hate it or like it, Linkin Park will be what Deep Purple or The Beatles is today, and they started out just like them (well, I dunno how DP started): being looked down. "Oh, hip-hop and metal? How cute kidos, good luck selling 50 copies of your albums then stop disrespecting those music genres, ty. It will never work" Then BAM, get fucked, it even made MTV to play Slipknot songs because everyone wanted the nu metal. It was fresh, easily digestable and it spoke to our generation; everyday teen problems. Abusive parents? Break-ups with your girl-/boyfriend? The hardhip of friendships? Being looked down by the elders? Or are you just fucked up for no particular reason? No problemo, just pop in your [insert nu metal band]'s disk and shout the chorus with them and make sure you will put their lyrics on your MSN signature, because it's fucking important to quote In The End.
It's funny, because most of these songs or albums hold real value, even 10+ years later. Shad0w said it perfectly, most of us had moved on to different genres (hey, I told you, if I had not ask my friend to write a copy of Slipknot discs to me, I might've not been listening to IF now), but we don't look back to those days as "wow, how silly we were for liking that!".
And to draw an IF analogy, those bands - who were goddamn famous - eventually switched from nu metal, so it's even funnier to read all the hate for IF abandoning (not even entirely) a style that was appreciated by some MDM fan. Wow, such career, I bet the guys in IF wanted to die as "the folks who were a pretty damn good MDM band in Sweden, thanks guys - official certificate of the MDM fan club". I'm not surprised the nu metal explosion inspired them, it was a big fuck you to every band playing the same shit over and over again. Pretty much one nu metal song had more versatility than some band's entire discography, and Slipknot was a good example to show that you can even make THAT work (and be popular at the same time) in the nu metal scene.
Now, there are obviously exceptions; like you can't just switch from power- or death metal, but IF was in a lucky position that MDM contained the word "melodic". Some might listened to them for the death metal elements but others dug the melodic part. If you want to drop one of them it's a pretty easy choice if you ask me, especially since the whole band was created to not have to apply for death metal rules so it's not hard to imagine the guys were getting closer to creating cool melodies instead of ruturning to what they've been trying to get away from. How much seeing that you can even make good money from being bold in music, not letting outsiders tell you, THE ARTIST what to create and how much Anders' having troubles with the growls affected the way of their evolution, we will never know, but we are much more who are happy for the change (especially if you count those here who liked the old IF better but can appreciate the new one as well) than those who got alianated forever.
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This review linking is getting funny by the way, there's a 10/10 for every 1/10, so it makes no sense to point them out. "Look, this guy thinks it shit as well, so it's shit", welp, another guy thinks it's great just like I do, so there we go, back to the starting line. Also, you people forget how much hate-wave can affect people's judgement. When I read everyone shitting on Becoming The Sky here I went on to listen to it, and 2 mins into the song I was ready to judge the song as shit with a nice guitar melody. Then the phenomenon of the hate-train wore off, listened to it a few times and it's actually a pretty decent track. It's extremely easy to to snowball things out of control. People wanted to hate Siren Charms long before it was even conceptualized because they are bitter about IF in general for not returning to their old sound, and people are easily influenced. Seriously, some of the hate reviews says WWEO is the only track which holds quality, while others bash it to the ground for being shit. WHICH ONE IS IT? Comedy.