As you may have noticed, USSR DDs and DE cruisers will come into game soon - you may have met them already.
Generally speaking, USSR DDs are more like light cruisers (definitely once the Italians come into play) - fast, big, with main focus on guns. Not sure I like them, though for good players they offer some advantages... However they are also quite easy to hit as they are kinda sluggish.
DE cruisers have mostly nice flat trajectory guns, so they hit quite a lot, but them Germans should have built them with somewhat stronger armor. I mean citadels are nicely hidden, but still the ships are quite squishy. Though fast turrets in most cases can balance it out... Solid ships I would say, but sore disappointment for Wehraboos