I have JUST ONE THING to say. SUPER SPOILERS,.

Rating: 5/10 (20 June 2014)

Complacency is not your friend.
Kill it with fire and burn it to the ground; I take the Draco method with selfsameness if you haven't already figured it out.
This movie starts off predictable, gains some groundwork in the middle, and completely loses focus at the last half.
Oh, by the way, Stoick dies. When you realize this, you will cry. Trust me.
But trust your instincts over anything else. My instincts told be to be wary. Aye, they were right... boy, America needed more Scottish-sounding accents like it needed an ice spear to the head. XD Sorry, am I being too harsh? What's truly wrong with this movie is that we lose our beloved Hiccup and Toothless to convention. Now, I love these two. It's *because* I love them that, were the sequel up to me, I would defy the loosey-goosey plot devices in a second.
I'm not convinced when Hiccup suddenly surrenders himself to The Best Thing In This Movie (i.e. TAKE ME!!! ^^) nor am I deeply moved by Valka's plight.
What I am convinced was that the creators were thrown to the dragons by DreamWorks, who told them to make a sequel and have it done by summer 2014. The animation is passable, but a little underwhelming after Frozen (God Bless you Elsa, may you star in many of my dreams tonight O_O). The comedy is only good when Eret and Ruffnut are involved and the few dramatic movies scarcely reach the depth of Stoic's passing.
The heartfelt and whole-hearted connectivity of Hiccup and Toothless is at once a warm hug and a dagger to the heart, especially in that final moment when Hiccup must solely rely on heart - thank you Astrid - and heart alone. It is a miracle for the two brethren and yet a curse for those who expected more. What I mean is: they didn't earn it.
HTTYD 2 takes the beautiful heart and expands upon it, but it's done so gracelessly you'd swear you were stuck in neutral. I wish only good things for Hiccup and Toothless, aye, I love them. But the cliché (Hiccup, more upset then angry, sends a confused Toothless away after he's done a horrid yet accidental deed), the repetitive (didn't we already see that Toothless was a master doodler?) and the commonplace (yes, there's a lot of different kind of dragons. WE GET IT) make it so that this classless little grand adventure cannot truly stand up to it's sophisticated giant small epic.
Also, Hiccup is too much of a goody-goody and Toothless has lost his edge and is far too childish to merely have grown out of his bratty behavior. Much like Stitch throughout his stint through the grind of sequels, Toothless has been robbed of his edge.
I'm sorry for the loss of their personalities, I truly am. But I am NOT SORRY for the loss of their integrity. Though the first movie was nothing new, the *execution* was that set it apart from the pack.
Though I did not expect Stoick to die, it's not any easier saying that D: , I bet others could see it coming in the song-and-dance number. I could go on and on. If you want a fun, family-friendly(?) movie for tweens (could be a bit intense for the under five, but hey, I only thought Mufasa was sleeping in kindergarten ;) ) by all means, go.
I don't regret revisiting my beloved Berk, but I do regret the abysmal fall into standard children's movies. You will be avenged in Fanfiction my dear Toothless, TAKE ME!!!!!