I’ve seen both good and bad Jira configurations. And I’ve seen them run on both good and bad hardware solutions.
There is a reason why Atlassian is getting rid of Enterprise Jira, because it’s really hard to build a good hardware solution for running Jira properly.
I submit that anyone who hates Jira probably has not seen a good Jira configuration. And anyone who loves Jira probably has seen a good configuration and doesn’t understand what everyone else is complaining about.
Jira is a real Jekyll vs. Hyde type of tool. In my experience, how you feel about Jira says much more about the type of configuration you’ve seen than anything else.