I'm not really sure there's anything about it that I hate. Hates a strong word- A word I would use to describe my Windows Mobile experiences prior to the iPhone.
I do have a small wishlist, with the top item being native integration with the iDisk and file syncing. I'm aware of 3rd party solutions and use them extensively but I feel this is something that should be integrated into the phone right out of the box. Storing documents on the iPhone and being able to view them is exceedingly important to me. The only native solution seems to be using Mail or iPhoto to get them on there, neither of which is satisfying.
Honestly, both MMS and copy/paste are at the bottom of the list for me. Most of the work I do on a computer I prefer to do on a computer due to its complexity so copy/paste aren't an issue. And despite having used cell phones for around 12 years I've rarely used MMS. I know there are a lot of hard core texters out there but my needs for exchanging media on the iPhone have been met by e-mail.