High Elves will be nasty to skrox units with those re-rolls to hit! They're pretty much going to get every attack through as a casualty...I think in your case (against HE's), skrox are a bit weaker.
ThatFrogGuy said:
...although I only lost resolution by 2 (i had charged, and had a banner...the extra ranks helped, but not to the point of saving my bacon.
Regarding the CR, you should be testing on the unmodified leadership of 7 even though you lost by 2. The way you phrased the above makes it sound like you didn't use the steadfast rule (you have more ranks than opponent=steadfast...unless you're disrupted). This is really important because it could mean the difference between your skrox staying or breaking.
Anyway, just wanted to check
IMO the skrox can really only be used to flank in larger point games (when you also have saurus blocks). As you said, they are a big points cost (to be effective) and won't have much support in a smaller game (<1500)