This thread hmm...
Definitely MK, or specifically storm bolt.
BM however has insane DPS.
I too am sick of the hero focus of WC3. Human? Go AM. Undead? Go DK. Blah.
What I've done recently is try to do strats that are uncommon. For instance, I go MK and breakers with humans, or necromancers with UD.
Check out the hero shop.
A lot can be hard to use, but try the Goblin Tinker. He can creep orange level creeps BY HIMSELF and becomes unnukable come level 6.
Another thing that pisses me off is Orc.
Windwalk is so annoying, to new players and to veterans. Do something to it, maybe make it last shorter.
Ensnare working on heroes is also just as dumb. True, spells like cripple, cyclone, work on heroes, but it requires dedication. Casters, upgrades, tier 3, etc. Orc, it's simply drop beastiary, upgrade it and raiders.
Bats have pretty much removed going large amounts of air against orc. No gargs, no hipporiders, etc.
I've played WC3 recently, but always trying new things. Meh.
Herocraft most likely.