I used JIRA for a number of years on a daily basis and it is easily the worst bug tracker I have ever used. I would choose any other bug tracker I have used over JIRA any day, even BugZilla.
The connection to mongodb is that their team chose JIRA and continue to use JIRA. I was implying that by choosing such a horrible bug tracker that you must question their code for mongodb.
In retrospect I probably should have added a smiley face or not made the comment at all, since it's entirely possible they didn't have a choice in the matter and JIRA was chosen for them by a pointy haired boss. After all, I was forced to use JIRA at my previous job and the quality of code I produced and technical decisions I made were not affected by choice of bug tracker. So to any mongodb devs reading this who may have been offended, I am sorry and I feel your pain in having to use JIRA, I hope you can escape it soon :)
