We recently discussed with one of our customers about their customer, who wanted to get rid of Atlassian JIRA. The underlying reason for this was a simple one: JIRA is just too complex for their needs. Naturally our discussion with the customer revolved around JIRA alternatives, which could provide the team with a flexible issue tracking tool.
We ended up comparing a bunch of different software configuration management tools and especially their issue tracking features. For this particular customer, possibility to set the issue's priority and state according to your own workflow was a must-have, which is pretty evident in the following comparison.