Why is vcenter 5.1 so much harder to install?

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1023864

http://thesaffageek.co.uk/2010/07/05/active-directory-web-services-encountered-an-error-while-reading-the-settings-for-the-specified-active-directory-lightweight-directory-services-instance-active-directory-web-services-will-retry-this/