They all look like they're either Noren's work or copies of his style. I don't think Noren has done more than a handful of good covers and am not a fan of his style. In general, i'm not a big fan of any digital art because it doesn't take much to find graphics and blend them together in photoshop. I just don't like photomanipulation and don't think it is generally the best kind of artwork. I like old school cover art.
Thats not to say that i don't enjoy ANY album covers that have been digitally manipulated, i just think the style has been done to death, it's tired and boring. Also note that CG art that is legitimately created is different than photo manipulation, but i still prefer good ol' fashioned artwork.