These two should have only been friends.

Agreed. ^^

Yep!

Kristoff and Anna and Tiana and Naveen.

Agree with audreybrooke.

Rapunzel and Flynn too, I find them to be a bit mismatched, but at least they have some purpose as a couple. And while I'm not fond of Tiana and Naveen together either, they need to be a couple for the story to work.

Pff no doubt

It feels so contrived. Whatever the other two couple's problems, they still share some genuine romantic chemistry, learn each other's deepest secrets, fears, hopes and dreams, and share some believable story arcs. They inspire the other to be better people.

These two share NO romantic chemistry, barely spend any time with each other (by the movie's timeline, it can't be more than two days by the time Elsa thaws winter), and most of the time they do spend is bickering and sniping at each other. They don't really learn anything profound about the other that casual friends and family doesn't know. They also don't really inspire the other person to be better. Anna stays the same throughout the movie, and while Kristoff starts being nicer to Anna and helps save her from the freezing spell, that's because she's dying.

That's kind of the basic human thing to do--rushing someone to cure to something that's killing them. Unless Kristoff's really a bad person, I don't think being gentler to Anna, taking her to see the trolls, then rushing her to the castle to end the ice curse is a reflection of how much he "loves" her; it's a reflection of how dire her situation is.

i found their relationship to be rushed