“Frozen” falls squarely (so to speak) within the classic mold of Disney animation, though it’s several rungs short of the studio’s early-1990s run that reached its zenith with the eye-popping visual imagination and nonstop inventiveness of “Aladdin,” and well below the 21st-century benchmark set by “Tangled” a few years ago. (Of course, Pixar’s “Up” and “Wall-E” occupy another level entirely.)
