Ignoring Lore per se; make a faction of your 6 favorite races:

[Frozenbeef]

worgen, space goats, panda, undead, goblin, belf

[chibichibiko]

Tau, Dark Eldar, Chaos, Orks, Vampire Counts, Necron.

er...wait...

[bohapjut]

Tauren, trolls, night elves, blood elves, orcs, humans

[checking facts]

undead, naga, eredar, dryad, succubi and shivarra

[wimbo125]

Humans, High Elves, Dwarves, Gnomes, Night Elves and Worgen!

[Azutael]

Forsaken and scourge together, with access to the frostwyrms, necromancers etc that in-game, only the scourge has.
Don't need anyone else ^_^

[Deleted]

Jungle trolls, Forest trolls, Ice trolls, Sand trolls, Dark trolls and Dwarves

[Szemere]

Goblins, Gnomes, Dwarves, Gnolls, Murlocs.

The small people will strike back!

[xskarma]

Dwarves, Gnomes, Goblins, Pandaren, Draenei (for the females only) and Humans cause I need 6, and because the reputation racial is awesome.

I'm still kinda hoping that they'll redo the racial system in the next expansion AND that we get all the new char models. Then I'll probably rethink what kind of race/class combos I'll do even if it is just kinda wasted money.

[Futhark]

Vrykul, Iron Dwarves, Wolvar, Ice Trolls, Blue Dragonflight, Bolvar's Scourge

Go Northrend Faction! Kill them all!

[Deleted]

Night elves, Tauren, Trolls, Blood elves, Forsaken, Draenei

[TheWindWalker]

Ignoring Lore?

Humans, Night Elves, Blood Elves, Trolls and Draenei.

Mostly for the s̶e̶x̶ plot that could come from such a grouping.

[OzoAndIndi]

Hmm... Blood Elves, Humans, and Ethereals for sure... maybe Night Elves, Tauren, and...either Trolls or Undead? to fill out the other half.

[Chain Chungus]

Is this playable only? Cause if not:

Hill Dwarves, Mountain Dwarves, Dark Dwarves, Iron Dwarves, Frost Dwarves, and Earthen Dwarves.

[HeedmySpeed]

Forsaken
Tauren
Fel Orcs
Qiraji
Ethereals
The Faceless Ones

[Deleted]

Playable:
Trolls, Orcs, Tauren, Humans, Dwarves, Pandaren

Non-playable included:
Trolls, Orcs, Tauren, Ethereals, Titan, Naaru

Breaking the rules:
Trolls, trolls, trolls, trolls, trolls, trolls


Whenever someone says that Pandaren are a child's race, I look at their dancing Forsaken character and sigh.

[Slowpoke is a Gamer]

The "stop fucking around and save Azeroth" faction.

Night Elf
Tauren
Pandaren
Troll
Draenei
Jinyu

[Tojara]

Orcs, Goblins, Trolls, Tauren, Dwarves and Forsaken I guess.

I hate Worgen the most, closely followed by Draenei.

I could see the joy on the other faction as there would be a 45% blood elves, 45% humans and 10% of the other left over races.

Including non-playable it would probably be.

Orcs, Goblins, Trolls, Mok'nathal, Ogres and Tauren.

[Feali]

Humans, Night Elves, Blood Elves, Draenei, Undead and Pandaren.
The faction of most appealing appearances (lol).
Oh and it would be female only

[KungFuFanta]

Tauren: strong in war but they generally don't seek it. They're the greatest race in Warcraft to which we should all look up to.

Orcs, post Mannoroth corruption: as strong as the Tauren, but more warlike. They're the go to people for first assaults.

Gnomes: less suicidal than Goblins (by a small margin), without them you're just stuck at bows and arrows and magic, no mechanical ingenuity.

Worgen: best mix of human and ... something else. Humans CAN be great diplomats and they're intelligent, with a ferocious side added to the mix they're great.

Dwarves: best builders, hands down. You want to build stuff that lasts through a nuclear strike? Go see the Dwarves.

Draenei: they have the war-like capacity of the Orcs, the wisdom of the Tauren, the intelligence of the Gnomes and a balanced, spiritual philosophy.

The least wanted would be something like: pandaren, blood elves, goblins, forsaken. Trolls and humans are ok.