Embargo has just lifted and the reviews indicate that this entry is as good as the previous 2.
Rotten Tomatoes : 100% - 7.0 Average Rating
Metacritic : 82
Michael Rechshaffen- The Hollywood Reporter :
"All told, by the time How to Train Your Dragon: The Hidden World nears the end of its Harry Potter-esque closing trajectory, in which Hiccup must learn how to let go, the bittersweet result will have audiences finding it equally hard to say goodbye."
Peter Debruge - Variety :
"How to Train Your Dragon: The Hidden World" packs the emotional heft of the dozen or so years it has taken to get this far, tracking the loss of one parent, the discovery of another, and several momentous lessons in bravery and loyalty along the way"
Robert Abele - TheWrap:
"Writer-director Dean DeBlois caps his emotionally intelligent adaptation of the Vikings-and-dragons book series with an enjoyable, beautiful story of destiny and freedom."
Michael Nordwine - IndieWire:
"The Hidden World" strikes a bittersweet chord in reminding its young audience that all good things - including the age of dragons - must come to an end."
Sarah Ward - Screen International:
"Eight years on, the How to Train Your Dragon films might not break any new aesthetic ground... but they remain as vibrant as ever."