I think DoD actually recycles a fair bit from VXI, TXF and BNW (I mean, hell, some of the riffs and chord changes are lifted straight out of them) but they're done *better* than they were originally. I can understand why people say it's just more the same, because it is, but it's like practice made perfect. (or at least better).
If DoD (without the seriously dodgy art) and BNW were released the other way around, I reckon DoD would be considered a fully fledged Maiden classic, and BNW would be held in nowhere near the same esteem.