I dunno, I'm partial to VII. I think it's pretty darn tight, and the lyrics are the best he's written. It does tend to veer into a "dark rock"-kinda vibe occasionally, which is a bit annoying.
That said, Redefining Darkness is awesome. There's a ferocity to it, which was lacking on VI and VII.
I'm kinda bothered with his English pronunciation though, which I think comes through more clearly than on the earlier albums, since his vocals are more "eloquent" in their growliness these days. Same issue I had with Graveyard's Lights Out.
Occupational hazard I guess. Swedes hate Swedish accents.