Thank you, thank you very much guys, better than I thought as I was dreading getting a balls busting over stats.
@Killer Karetsu: I think you're spot on here, I felt the same but unlike Zahrus fine undead these guys don't come with officers or their own Necromancing dudes per formation. So, despite the normal human base stat of 1D6 they are still weaker. Necromancers will have to keep nearby to control this lot and poor Warhead's gonna need some help for that or be too busy exerting control to do anything cool. Of course if there isn't anyone in control then Stats will have to suffer and they'll become fairly random, something like: -2 to skill and must range attack or engage in close combat the nearest living target, avoiding impassable terrain etc where able.
The D6+1's and +2's are for more Elite units (so fewer units or simple stepped up stats but not much else) made with stronger Death Magics and so should have better stats IMO. I'm using the Skeleton example from the excellent fight in Jason and the Argonaughts, where they fought with all the same agility and guile as a living soldier.