I'm sorry that your day was not what you expected. My wedding had some flaws as well (including guests missing the ceremony), and I am hoping that my vr will be perfect.
In reality though, there is no perfect day. You have to expect that some things will go wrong. I can see the disappointment on your face as you walk down the aisle, and it should not be like that. I think you should focus on the positives of the day.
As far as the photography - I think DPS did a good job. They may have missed a few shots you wanted, but overall, as a photographer myself, I see a lot of artistic elements, and a few bad shots. That doesn't excuse missing your requests, but many times it is not always possible to fulfill all of the bride's requests due to time constraints, location, or circumstances.
I think the difference between DPS and your friend is their styles. DPS is more formal and your friend is more artistic. I think that you should have hired your friend if you wanted that particular style.
I hope that you will remember all the positives of the day, and try not to place anger and blame on everyone. I hope that Disney is able to compensate you in some way.