And about heroes... The "one man army" heroes, like the MK and the DH, are still huge threats alone, especially at high levels. If someone has a few high level heroes, they can still dish out a good deal of pain, and are pretty much still in the fight.
I had an ally back when I played 3v3 in 1.02 who had nothing left but his 3 Human heroes. However, he was a very good hero microer, and had a level 7 Pally, a level 7 MK, and a level 8 AM. He would do little hit and runs with all 3 heroes and Mass Tele, and do respectable damage as well. In the full scale battles, he helped us out with Clap, his WEs, and the super powerful Blizzard of 1.02. By game's end, he had all level 10 heroes. In fact, this game had inspired me to take up Humans, who remained my primary race up until 1.04. Don't remember the guy's name, but I had quite a deal of respect for him, and it earned my respect for Human triple hero.