I had to manage our corporate JIRA for a few years after the previous admins managed to get it stuck in an impossible configuration. My experience was it worked good enough if you stuck to the defaults. Spent a few weeks ripping out all kinds of weird workflows and started trusting the users instead. The thing was not perfect, but compared to the other stuff we had i'd give it 8/10 (or a B- for you Americans out there)
Then a bunch of contractors came in with a paper full of boxes and arrows, titled Enterprise Workflow, and demanded admin access to do everything themselves. One month later stability is down the drain for everyone, and a few of their issues are jailed in a state, unable to go back and forth in the workflow, never to be closed or disappear from their status report. They declared Jira a non-agile, buggy product and bought something different. Our users now hate both products and track issues in excel.
Then a bunch of contractors came in with a paper full of boxes and arrows, titled Enterprise Workflow, and demanded admin access to do everything themselves. One month later stability is down the drain for everyone, and a few of their issues are jailed in a state, unable to go back and forth in the workflow, never to be closed or disappear from their status report. They declared Jira a non-agile, buggy product and bought something different. Our users now hate both products and track issues in excel.