So much hate everywhere for this product, I'm glad I don't use it.
However the last few times I've used it, it wasn't the PM process that sucked - in fact I loved my PMs because I got to offload most of the Jira upkeep to them and never touch the tool myself. However every time I have to use the pile of shit myself I end up mumbling quite colorful language.
Some places it's bad enough that Jira is used to appease the people with the purse strings, and the inputs have no bearing on reality at any given moment, while all the real workflows are tracked using paper note cards pinned to a cork posterboard that sits on Joe's desk behind his monitors.
E.g. we were forced to switch from Jira to Rally, and it turns out that Rally is much worse.