I thought Blizzard started banning for team killing.
No race sucks. Although I do have a much smaller win ratio with orc.
As for humans, I like going archmage and foots with defend. Creep like hell with elemental and sometimes expand fast. Paladin as a 2nd hero is good stuff.
Undead can be good. I can expand with them on some maps so freakin fast. Just get the beetle hero with impale, 5 ghouls, impale all the creep on the mine twice, and expand.
Ghouls suck for rushing. I always like getting 4 ghouls on wood and going fiends. Keep fiends away from archers and focus them on stuff like hunts at rush because hunts die from piercing fast and archers only take 35% damage from piercing.