Lego always looks lame. It sort of tames down the whole thing. A good example is the dementors. Scary in the film but hysterically funny as Lego.

I think the same could go for the Krum lego dude and the Durmstrang ship. Krum'll probably look alot more realistic (however they've given him fins there and it's meant to be the head of a shark also) and the Durmstrang ship, I hope, will look sort of creepy and daunting.