You seem very nit-picky in this rant. Then again, it is a rant. However, a lot of your arguments aren't fair. The movie is great and you seem to be arguing that stuff that you and you alone didn't like.
Olaf is a great character, he's certainly more interesting than Sven, and at least he HAD character. He helped Anna when she was freezing to death and he was willing to melt for her.
Anna is not a bland character. She was a neglected child and grew a fanciful personality because of it. Why is it that people can't accept that there really are people in the world that truly do believe in good? You're reading the writings of one right now.
The parents were bad parents. There was no saving grace for them. They were bad parents. There are no ifs, ands, or buts about it. It's a message on people who expect perfection of their children. No one can expect it, so Elsa suffers because of it.
The trolls. Seriously, you're sounding nitpicky. You didn't like them, okay, I get it. The thing with Elsa's power is basically, "With great power comes great responsibility." Plus, you can't tell parents how to raise their children, that's rude and horrible. It doesn't matter how bad they are, you can't do that to someone. It's not your job, your life, nor your responsibility.
Hans is the perfect example of someone who tries to save face and appear good, but there's no hiding a black heart. Last-minute? I wouldn't say that, he did break a cliché Disney has suffered from for years. Ask people about Cinderella and they'll tell you it wasn't true love. That's exactly the point of Hans. They spent the same amount of time talking as Cinderella and Prince Charming, yet you can't argue it's true love. You can't possibly know a person until you've spent time with them. Even the whole true love's kiss thing is great. Even after we know he's the villain, he still speaks eccentrically and tries to sound good. Yet, once you know someone's true colors, there's no hiding that.
The conclusion. Love. Yes, love. No, not true love's kiss. Not star-crossed lovers. True love. Family love. When have you ever seen a movie where love is the defining message and it's not some cheesy romance? You might think it's silly, but I think it's great. Sure, there is no fixing the years that Elsa spent alone, hardly talking to Anna, but Anna sacrificing herself for the sister she barely knew is true love. How many people would be willing to stand in front of a sword or gun for the person they love? Yeah, sure, tell me you would. I'd really like to see if it's true. That is hard, but Anna was willing to do it.
All in all, Frozen is a great movie and it's a breath of fresh air from the stuff Disney usually produces. It's hard going back to stuff like Cinderella after seeing this.