Agree with Dan up to a point, you can hear the quality of the songs despite the production - as I've said many times it's the worst Simon Efemy job I've heard. As for the artwork, well, I don't judge a book by the cover (although some people will) and I've certainly seen worse.
But I can see where the band are coming from, NVS comes over rather poor when compared to BotE and the band no doubt feel it doesn't represent them very well. It's rather like the Fear Inside EP, the band have moved on an awful lot since then.
Of course, as the band now own the record, they are free to release it again in the future should they choose to (seems unlikely at the moment, admittedly) or even rerecord the album at some point.