Not a great sign in some ways, although the fanboys seem to still be excited.
Also, apparently the hyper-realism from shooting at 48fps is leaving some reviewers jaded, due to the unrealistic appearance especially on the set pieces.
RottenTomatoes does have it at 75% right now, with 15/20 reviewers giving it a positive.
One of the larger problems is that we've already sat through three middle-earth movies and this is becoming old hat. Still not sure trying to squeeze three 3-hour movies out of a book that is smaller than the shortest LotR book was a wise idea.