Honestly I think Thrall's done enough with Garrosh. What's garrosh gonna say to thrall that he hasn't already? What is thrall going to say to him?
"I HATE YOU!"
"yeah, I know."
The rest I agree with though, I feel like Tyrande/Malfurion/Illidan/Aszhara cross overs particularly strange since they're all active players in the expansion. Its not like they're off screen they just aren't...actually seeing eachother. No reuinion, and for some reason the 'big win' for the night elves wasn't defeating Aszhara, their long-term nemesis and blemish upon their race....but retaking one zone they lost and having their leader go on a useless murder-suicide romp that she just got better from eventually.