What you're seeing isn't people that hate the game or hate certain jobs. What they are are people who want those jobs to be better. Providing feedback on what you don't like with a job gives Square an opportunity to fix those issues. Providing feedback on changes that were made that players don't like lets Square know to not do those changes in the future. There's not a whole lot of "discussion" in "I really like X part of Y job" other than "Yeah, me too."

All jobs are "ok" right now. They're all in an "ok" spot. A lot of people suggest checking out Dragoon and that's good if you want to understand why everyone is vocal about changes, because Dragoon is likely to be the next job that people complain about in 6.2.

Don't let people giving negative feedback somehow warp your view on a job though. That negative feedback is meant to say "This job can be better." not "This job is garbage."