you probably have some cards side decked (and you ought to main compulse) for dracossack. he really isn't that big of an issue imo
also, dragon rulers tend to play vanity's fiend.
LADD, sack and opression on the other hand, as you said, is far more problematic. that's just not fun. however, that's a two turn combo at best because you have to activate opression before LADD hits the field and during your own next turn after you summon the tokens because your opponent can and will negate the tokens. so to be fair, you have a little bit of wiggle space.
but yeah, despite everything i've said, i actually agree, it's way too strong, i hate Royal Opression with a passion and it needs to be on the list forever. lol