My Atlassian experience is only with JIRA as a developer. I'm with mml. The user interface drive me nuts. It gets in the way of me communicating with the team.
The dashboard reports things like time changes. "gry changed the Time Spent to '13920' on FOO-1000" I don't care how many seconds someone spent on an issue. If you have to configure a humane interface, something is wrong.
This is a small example. It takes my locus of attention away from doing what I'm paid to do, write software.
I need to communicate with the team and ask questions in order to get more information to complete an issue. I'm still responsible, yet our workflow requires us to assign the issue to someone in order for the question to be answered, then assigned back. It feels like I'm shuffling tickets rather than communicating around a ticket. The emails sent aren't humane. Don't get me going.
Yet, I can't reply to a JIRA ticket via email as a standard install?
The gist is, after using JIRA daily for seven months, I'm struggling. It feels like the user interface reflects the data model and I don't want to learn it. I get it, it's powerful. But why introduce how complex it is right away? There is no carrot. There's a carrot pile and when you're building velocity, it's not fun to jump over.