Space stations. The GW ones are crap, barely suitable as orbitals and certainly nothing like the picture in the BBB.
+1.
When they rolled out their "space station/orbital dock" model... it was not what I had in mind.
As for scale and detail. Detail's very important for me. If I really wanted to just push colored markers around on a table, I'd get some cardboard circles and write ship classes on them. Scale... As long as things are reasonably to scale with each other, I'm happy. I feel like the BFG ships were pretty well done in that regard, certainly within each fleet to each other.
Across fleets, well, there's definitely a difference in displacement between a Retribution and a Desolator, and yet they're both 12 hull points, for example. Chalk most of that up to the stylistic differences in hull shape, but the chaos stuff definitely seems more massive than the imperial stuff. That said, I'm not sure my longer, thinner plastic chaos battleship is that much better of a solution, since it breaks the proportionate ratios. Tough call on that.