Hordes don't lock the doors like scared babys??? Ask to Garrosh in SOO.
Orc have blood lust, but they are flesh and bone, they can't be stronger than a Stone animated warrior which can weigh 1 ton.
once again, you're confusing the strength with winning a fight, Lothar killed hundreds of orcs before fall in combat, and this doesn't means he's phisically stronger than a orc, but more skilled.
Read this:
1º
http://wowwiki.wikia.com/wiki/Muradin_Bronzebeard
2º
http://eu.battle.net/wow/en/game/race/dwarf
''
The bold and courageous dwarves are an ancient race descended from the earthen''
''Led by King Magni Bronzebeard, the city’s resilient inhabitants proved to be the backbone of the Alliance forces,
helping to secure victory after victory against the orcs.''
Dwarves are one of the most skilled warriors in the battle, and possibly the most powerful army.
Didn't they cry in fear? :D
You can be a fanboy of orcs, but you must know that they LOST and MORE ORCS DIED than any other races during the second war. Actually they are one of the less numerous and near of extintion race.
P.S: Draeneis were in a interdimensional ship, not floating in 0 gravity. You said they are ''fat and low muscle and bone density'', then, explain me why they appear to be bodybuilders on steroids in game, cinematics and pictures :D