I think Nuclear Fire was my intro to the band.
I'd agree that their first 3 or 4 albums are all pretty good. My interest started to wane with Seven Seals, however it was around the same time that I lost interest in the power metal genre overall, so I can't blame that album necessarily.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.