Personally, I love my Samsung Captivate. However, I cannot ignore the fact that I feel that the Captivate has been crippled in some ways. I suggest an AT&T executive read this and consider these updates to the Captivate.
Android 2.2 FroYo with Lag Fix pre-installed
Installation of applications from non-Market sources
FM Radio enabled if the hardware for it is still in place
3G Mobile Hotspot
ability to remove AT&T applications (or just offer them in the AT&T AppCenter section of the Market for those who want to download them)
These updates will make the Captivate a much better phone.