No, it's not, he's ungrateful, he purchased the game, he didn't pay for them to continue development of DLC, yet he demands more.
Bethesda specifically said they had a surprise for Skyrim fans this month, which at this point, looks like it was just Kinect.
Let's get real here: That announcement was purposefully made as a publicity stunt for Dishonored. They knew that announcement would have every Skyrim fan and gaming journalist watching their blog, and ta-da: now everybody knows about Dishonored. They basically blew the Kinect thing out of proportion just to give Dishonored publicity.
Dude has a right to be annoyed. If they promise an announcement, then he deserves one, whether he paid for it or not. When it turns out to be Kinect, I think it's reasonable that he's disappointed, considering only a third of the population can use Kinect.
The other thing that's getting people frustrated is simply, now we're to a point where the pressure is on. Fallout 3 and Fallout New Vegas both delivered DLCs about...every 2-4 months? New Vegas, iirc, was October release for the game, December/January release for Dead Money (X-box had december), Honest Hearts had May, Old World Blues had July and Lonesome Road had September.
Well now we're almost half a year after release. Two DLCs for FO3 or NV could've been released within this time. Not saying that means they need to hurry up; take their time if they feel they need to, but yeah, I AM saying pressure's on now. If the first DLC is disappointingly small or something, then yeah people will be ticked.