Curious how much the interface changed and if you think that plays a role in the sentiment towards it. VB6 I'd expect a desktop app or add-ins to office, going from that to web changes maybe more than necessary for the users.
But there were parts of the application that were poorly designed (our users told us so...) and so, even though they were the primary ones driving change, there's always pain when changing to a new way of doing things.