Jira is the single source of suckage
Over 16 reasons why Jira and Confluence suck
Jira is not as good as project management software for managing projects and not as good as bug tracking software for tracking bugs, it's just an event horizon of stupid user interface choices coupled with crazy backend design which makes it impossible to revert mistakes (and we do make mistakes because we're only human after all). Once a company realises their provider or end clients also use Jira then all bets are off, they connect up their Jira instances in the mistaken belief that it will make working with Jira easier and the fail grows exponentially as comments get sent externally that people didn't mean to send and workflows don't match up. The only thing that makes working with Jira easier is ripping it out and using better tools for the job.