What kind of Horde did you like the most?

The barbarian-abomination swarm of WC1?

The campaigning militaristic empire of WC2?

The true good guys actually trying to probe their new face of WC3?

Or the hypocritical colonizing confederacy of WoW?

The Horde of WC3 with a dash of the WoW Horde for realism.

Agreed. The idealism and honest to God "trying" was very appealing in the WCIII incarnation, add some corruption and unfortunate elements from the past, as touched down upon in WoW, and you'd have a realistic, dynamic and engaging group.
The failing of the WoW incarnation was that it went too dark, the combination Destron outlined would have been perfect.

Though a WCII incarnation, like you outlined Kir, could be good. As long as they remain largely free of outside influences and do things for their own reasons, also they'd need a comparable enemy to both oppose them and set the tone of the setting to be such that the Horde doesn't come out looking monstrous for its unchecked militarism. The tone I am speaking of is:"World is shit but we're all trying to make the best for our own." The role of that enemy would probably be best fulfilled by a conniving, imperialistic Alliance. Setting up clever political traps for the Horde, generally trying to put as many enemies between the Horde and them as possible. Besides being politically more savvy the Alliance is also better off, initially.
The idea is to put a daunting global challenge to the Horde so that as they overcome one hurdle after the next you can't help but gain a sneaky respect for these would be conquerors. Such an Alliance and Horde would also make for a perfect setting for complex politicking and powerplays which I get the feeling all three of us like.

However the good aspects of a militaristic campaigning empire could be thrown into the "WCIII with a dash of WoW" version well enough by making them more reserved in who they fight so I still feel that is the best version.

Definitely Warcraft III, though I'd appreciate a touch of the clan distinctions and cultural variety a la warcraft II. Not just for the orcs, but also for the tauren.

I liked Warcraft III to Burning Crusade Horde. It had some darker elements but it wasn't a faction of destruction like it is now.

I don't mind the forsaken being the way they are. The Horde should be a group of people strung together by desperation. Just show that we need the forsaken and disapprove of what they do. It won't make a difference to the Alliance but for the Horde it should feel like we have to do it. It helps that ragged tagged group of misfits things they have going for them.

Yeah, it's all right with the Forsaken being the darker aspect of the Horde, but they've gotten so venomous that it seems foolhardy to even ally with them.

WC3 to around BC is my favourite "era" of the modern Horde too. The Forsaken got away with their antics because they kept to themselves for the most part; same deal with Rommath's magi utilizing fel magic to help rebuild Silvermoon, not to mention the M'uru thing. The grey stains didn't reflect too badly on the Horde as a whole since these races were just so marginalized from the core trio on Kalimdor.

Now though, eh... It seems their fun reenactment of WC2's marauding orks has overshadowed even the Forsaken. >.<

Yeah they really went overboard Blizzard presents opportunities like the Wrathgate to purge out the bad elements but even after that they continue being bad.

Sometimes it feels like the whole Horde redemption thing was just a joke. We go to Outland to find the uncorrupted orcs and they end up being just as bad as the Old Horde without the demons. Grom's sacrifice and redemption was just wishful thinking and meaningless because his son his going to make the same mistake again without any help.

How do you justify to the Alliance to not to hate the orcs and forsaken?

At this point, you really can't. The Forsaken basically need to get full-on Nuremberg treatment.

If before their actions were not approved by the Horde itself and kept mostly secret and conspirative (man, I loved those sabotage Hillsbrad missions), then now their Scourge-like actions are just ignored, despite the fact that everywhere else players have to spend their time combating all sorts of plague and corruption.