They had potential. But as far as story goes, they've been sidelined. And the model quality, complexity aside, leaves a lot to be desired. (And that's just the males, who at least are cool-looking; the females could have been both savage and elegant, but instead fail horribly at both.)
Now it is past the shattering. The orcs have rebuilt the city after the great disaster, and now it is more fortified than before. Wyrvern guards fly in packs above the city to prevent intruders from decending from the skys (though i'd love to see a city raid in any major city where intruders do fly in!). Garrosh now warchief in Thrall's absence is overlooking opperations in the horde from Orgrimmar in the Valley of Strength. Will the warchief cause more strife among the horde inhabitants, and will Thrall let that happen? Soon, we shall see!
I adore my ghostly worm. He's great for just about everything other then PvP. He tanks his hiney off, makes a target take more damage (which is great for raid boss types- your entire party does extra damage!) and his thunderstomp grabs up critters for my guild's critter killer achievement.