Has it gotten better? Let's make a list...
Push Email - check!, yes it works way more reliably now.
Email syncing - no change. There wasn't much wrong with it before but, an email deleted off the iPhone still shows up in the inbox on the browser.
Calendar - no change, still a few compatibility problems with Outlook, no subscriptions
File sharing - no change, which is a shame. When are we getting that file sharing option I was so looking forward to?
Contacts - no change
So its gotten so very very slightly better, only because it's finally been stabilized. There're still bugs and missing features, but I have high hopes. As more and more people use it, Apple will devote more and more resources towards it.