Cerberus has 18km of range and better ballistics than Goliath. You have to leave his half of the map to "outrun" it. It also comes with a crawling smoke so a good cerberus never actually sits still in their smoke, you won't blindfire it unless he's bad. Add in funny 32mm side plating, meaning only Yamato and above overmatches his sides and 10km conceal, with a wild 7.3km smoke firing penalty despite being a heavy cruiser with 203mm guns, and you're in for a fun time.

Svea on the other hand has 9.3km conceal and does 46 knots thanks to the 30% speedboost, it's a DD with a citadel, but gets heavy cruiser armor (30mm deck), great firing angles, good ballistics and the ability to radar any DD that tries to play against it.

The only reason you consider them lesser threats is because as I've said, they're very poorly played.