I confess, I find the humans in this series plenty interesting. So that's part of it. But not all.
It's one thing to think of, say, ISIS as mindless hordes. But this really is mindless hordes.
It's like fighting a war and suddenly, instead of facing humans who are at least somewhat like you and could have views and purposes you might understand, you are facing giant cockroaches.
If that happened in real life, that would be awful and a serious battle, of course. And we wouldn't need it to be "interesting" or "make sense." But this is entertainment. And I just feel like this is a cop-out - almost to the point of being scene-filler. As if there isn't enough in the books/storyline to fill the 50 minutes. And after the first 5 minutes, it was pretty boring. Like a car chase scene that goes on too long. Or an overly-long wedding scene.
The White Walkers are interesting (at least in part because they seem intelligent, alien, and we don't know their objectives). Somewhat like the Wraith in Atlantis, or the 9 kings in LotR. But the skeletons are like the bad CGI clone armies in Star Wars. Sure, they are good CGI, by comparison, but still way too phoney and hokey.
Just my opinion.