I saw all 4 in theaters, and the one that gave me that 'OH MY GOSH" feeling was Wreck-it Ralph when King Candy was Turbo, I almost wanted to stand up and give Disney a standing ovation, because I really didn't see it coming.
As for why I placed Tangled second, I really liked the comedy of the movie, and the songs were catchy and made sense, Frozen's songs are rather dumb in my opinion, and although they're catchy, I don't know why they get as much praise as they do. I would listen to "I see the Light" instead of "Let it Go" 9 times out of 10.(It might be because I love Alan Menken)
Frozen's plot twist with Hans caught me by surprise, and I really liked that Disney threw in that "surprise villain" again-- This was also the downfall of BH6 for me, though. Since they had done the "surprise villain" in 2 out of 3 of their movies, I saw the twist coming and wasn't surprised at all, and that ruined the fun of the movie for me. I loved the characters, but like I said, I anticipated the plot twist and was right, which made the movie "Really awesome" instead of "Knock my socks off" like the others had done.