It's the main alliance town in hillsbrad. It's not supposed to be easy. When I was witnessing the past 2 raids, the spellcasters of the horde had no trouble killing the guards. All they did was spam AOE spells.

ALso, think about it. What challenge would it be to form a raid party, raid a city that isnt prepared/expecting it, and just slaughter everything because not enough alliance members are there to make their stand alone.

Regarding the "zerging guards", does this not happen in ANY horde town? When I monitored a couter attack against TM we got chased off by a decent amount of Deaht Guards. We didnt get very far in though.