true, BUT garrosh completely disapproves of how she is attacking the alliance. she is using the plague and killing and raising new allies just like the lich king and that drives garrosh a little insane. so they're both not really too fond of each other anyway

Since when were the Forsaken truly accepted, and since when did they care?

The Forsaken have always been somewhat unwelcome in the Horde. The only race that really "accepts" them are Blood Elves, and this is most likely due to Sylvanus Windrunner's presence. In general, the Forsaken are more of a "necessary evil".

They have always had their own motives and their own plans. The only reason they're with the Horde is because if they currently need them. If they're not with them, they're against them, and the Alliance never looked kindly on them to begin with.

Who would have thought someone called 'The Banshee Queen' might be a little passive-aggressive? Of course she'll do what Garrosh orders, even if she doesn't want to, although you can bet that she'll do it in a way that will cause Garrosh to wish he never asked her to do it.

Although I have to say - how many new races will the Forsaken be an anchor for? The Belfs were written in on the Forsaken, and it seems the Gilneans are now too.

The Banshee Queen isn't really being passive aggressive. She's being aggressive. There's not really much passive involved.
The Belfs coming in on the Forsaken's back is a little bit mixed- lots of the Forsaken characters were in Warcraft before WoW, and as Belfs. So it's a bit of a jumble really.

It's not that she cares about what the Horde or anyone thinks, rather it's that she cares for her people. She understands them and their curse. She does not like being apart of the Horde but from her standpoint an ally against the Alliance is better than yet another enemy. If things were to end differently The Forsaken would become a third faction of sorts.

She did order the plague to be researched however she never ordered Putricide to kill those at the Wrathgate and hey, it's how she fights.

In terms of Garrosh. No one likes Garrosh, in fact I think most of the Horde, that includes players not just NPC's hate him with a firey passion. Hell he kills Cairne Bloodhoof, AND has a little bout with Vol'Jin. No one wants him to be the leader of the Horde and the story is looking like he's not gonna be around for long. Especially if he makes a mistake.