- Not usable without browser plugins
- Referencing cards from other systems impossible (no stable urls)
- Referencing other systems from cards difficult. For example, try referencing a commit in a repo
- Not all actions on cards are logged
- Referencing cards from within cards in a stable way is impossible (hello web!)
- Limited keyboard control
- Changing certain things concurrently does not warn user
- Only two part hierarchy
- The complexity of over engineering processes shows up in a year in both JIRA and Trello. But in Trello you can't blame the program.
- Drag and drop frustrations in Firefox
- Side scrolling nightmare when pasting long logs because of narrow design of cards
- Endless gimmicks
- Advertisements in cards for plugins (at least I think it was)
I can go on, but I think I've made my point. Could you give specific reasons why you don't like JIRA?