I think we're going though wrong ways. My own opinion.
For me, at least, the main reason for the music style changing so abruptly from HTD to AYDY is that the boys (Alexi) wanted to enter more incisively in the American music market. It would be the boom of their popularity if they could grow in the US market. (And it was, ad you can see now. Brilliant move.)
I really like AYDY, but honestly, you can see how the songs are easier to "comprehend" since then. Less variations, more repetitiveness. The ~lack of creativity~ people keep complaining about is, in my point of view, because they wanted to hit a very specific public, and they did it making melodies that would hit people's taste, but, at the same time, trying to keep the "old Bodom", mixing styles. You know, it would take some tries.
Now, you may not agree with me, but Bloodrunk turned out to be a very messed up album, I'd say, because it had no identity at all. It was more of an experiment. Somehow it's like Alexi was trying new things to fit their style but with the same purpose of expanding their public. The songs sometimes sound the same, following the same style etc.
But, for RRF, I can't blame too much on them since it's a lot more stable album than Blooddrunk. With more variations, more original riffs between the songs, risky sometimes, but you can see it feels more natural than the album before. They changed their style? Yeah. But I would never say RRF is an shitty album. It's really well produced and recieved very positive feedback.
What I mean is, you can't wait the next album to be Something Wild pt. II, you know it will not. But Bodom is still Bodom, the essence is there.
It must be a shame in some people point of view, but I think that it's nice to try new things. It might come out really fucked up, but I wouldn't say it's Bodom's case.
But you know? I wouldn't mind too much if they added fucking samba to their songs if it meant they would do a shitload of shows in Brazil two times per year, holy shit.
Or maybe I would.