Q u o t e: The UD - ORC matchup is super broken, and I wonder if it's just because UD do the same thing every game... like what if UD went first, went DL for sleep and aura, and then did ghouls and necs instead of fiends which get owned by the ensnare/BM combo?
You're forgetting what other units the Beastiary produces, Wind Riders. That's one of Orc's major strengths against Undead, they can just swap to Wind Riders if the Undead tries to pull anything else than Fiends.
Sleep is also way too weak on level 1 to work as a starting hero. The DL can put two units to sleep which remain in that state for about 2 seconds, while the DK has 4-5 Coils to keep units alive / nuke low HP units / steal creeps.