I don't mind Jira, with the exclusion of the abominably confusing user management[1]. I've never found a ticketing system that didn't suck in some major way; it's a difficult thing to get right.

[1] Somewhere I've got a screenshot I made that has arrows pointing to the four locations in Confluence where you can find different ways of adjusting user perms (jira uses the same user system). This doesn't include the location where you actually manage your Atlassian licenses...