The Covenant carrier is just the existing Kepler Class with extra steps and those manned Lippisch rip-offs ( Rippisch? ).
The Russian Commonwealth also pretty much the same as the Spartan ones in shape and arrangement.
I could live with that, but the fine detail on some of these according to some people are somewhat lacking. And it's been answered with remarks like "the detail has to be exaggerated like with human figures, to make it fun to paint, and in any event accuracy and scale are irrelevant in wargames miniatures" and "if you find yourself obsessing over the realism of wargames figures you should have a word with the nurses about your medication" (The former from FB, the other from a forum post - Which was taken down pretty sharpish, I admit.)
That's all very well, however I feel it's not going to be useful for bringing in historical players in the future; I am damn certain it didn't in the past with later variants of WH40K.
Still, I wasn't planning on getting everything Warcradle produces; My fleets are going to get some backup in the future, since there are some nice designs it seems, like many of the Starter Box ones - but I'm happy enough with them (And 2.5) that I don't feel like any Kool-Aid.