Some notes.....
Is GR thier best effort ever? That all boils down to personal opinion, and arguing it is somewhat pointless. Not every CD a band does is going to trump all previous efforts in chronologiical order. And if you expect a band to rehash the same styles as they've done previously, then its clear you've never written any material yourself. Bands grow and evolve....and when you practice / tour, and end up playing some styles so repetitively, you require a change. Fans be damned.
However, I do see a trend here. The video.
First off, what little I watched of it is utterly typical.
Second, the editing. If ever there was a telltale sign of comprimising yourself, here it is.
"I know that no one's going to play a ten-minute song and, as I said, I want people to hear us. Even if they hear a shitty three-minute edit, it's better than nothing. I'm probably going to hate it, but if that's the only way for a band like us to reach out to new people, then I guess that's the way it is"
If you feel that people won't want to hear a 10 minute song, then why write them at all? Answer: you write songs like that because its what you do. The following this band has is extremely loyal for some very valid reasons. Please don't go fucking with it to "reach a wider audience".
You've done fairly well as a band up to this point by not comprising. Being willling to edit your own material to fit some industry-imposed bullshit time limit speaks volumes more than anything else you may say in an interview.
Having been around quite a while and seeing this happen before, I suspect this is the last worthwhile CD the fans get from you. Hopefully I'm wrong.
Oh yeah, one last thing from this thread:
Black Metal was characterised by deliberate lo-fi production quality on recordings
Artsist dont do a shitty recording on purpose. Its done because the band lacks funds.