Why? Personal preference.
The plot was rushed and had holes in it big enough to drive a monorail through. Olaf was shoe-horned in along with the completely unnecessary trolls. The music was lousy (That song Anna sang to whatever the bad guy's name was during the party was like nails on a chalkboard along with Idina Menzel's voice. I just cannot tolerate her voice.). The ending was bizarre and predictable....but my favorite was how both Elsa and the ice-cutter guy both gave Anna grief about falling in love with a guy she had just met, and then at the end Anna thought the ice dude was gonna be the one to save her with an act of true love because she had fallen for him...the guy she just met!
Don't bother arguing with me because you won't change my view of the film. I'm glad TONS of people disagree with me and are getting what they want from Disney. No sweat off my back. Happy for ya! The movie just wasn't my cup o' tea.
I liked The Money Pit. That is my answer to that.
Arguing with you? That would be really funny. lol I just don't take animation film that seriously.