Twilight Princess just isn't very good, is all. Still better than Skyward Sword, though.
The problem is, the awesomeness of OoT pretty much destroyed the Zelda series. They'll keep trying to catch that lightning in a bottle the second time, but they never will. And as long as they keep trying to imitate OoT, we're going to end up with pale, crippled imitations like TP and SS. They at least need to go in a different direction, so as to escape the shadow of OoT.