I think PvP is fun now in that they made it much more accessible for the general player base (which may or may not be a good thing depending on where you stand on the idea of dumbing down content to accommodate a wider pool of players). I played FL a fair bit before the rework and I didn't really enjoy having to juggle the complexity of all the PvP skills on top of navigating the chaos that is the PvP environment. Now that they've streamlined all the classes down to just 6 skills + 1 LB + the general abilities, it allows me as a player to focus way more on the tactical aspect of the game rather than having to fumble through the myriad of skills I have on my hotbar.
I also like how they moved away from the role identity and instead put more focus on specific job identities all equipped with a common survivability kit. I didn't really like the old PvP format where most engagements basically devolved to which side had better healers. It made it un-fun for tanks and DPS because it felt like you had little agency over whether you lived or died in any given engagement and incredibly stressful for healers because if they messed up, they effectively lost the engagement for everyone. Now everyone has their own play making potential and role requirements aren't as necessary as before.
Honestly as much as you hear people complaining about PvP on the forums, I think the numbers in-game speak for themselves. Absolutely nothing has changed with the format of FL but previously prior to 6.1, unless there was a Moogle Tomestone event going on that game players tomestones for playing PvP, it was basically impossible to find a match on duty finder but now most of my FL queues fill up within 5-10 minutes. I can play CC even at the most off-peak of hours and still find matches in less than 5 minutes.
All that being said, I think the state of balance of PvP right now is pretty bad. A good half of the jobs are basically meme picks while the handful of S-tier jobs get so much more value over everyone else that if you really cared about your win rate, you would be throwing if you didn't pick the strict meta classes. For the most part I wouldn't really invest too much time in ranked with the current state of balance because I feel they way PvP is now, it just breaks down the moment everyone starts tryharding for wins instead of playing the game mode to have fun. And that's in CC where the new jobs were primarily balanced around. Game balance in FL is pretty much a dumpster fire when you have 24 LBs at your disposal. Practically every match I get into these days, you'll set 50% of all players picking only WHM or SMN because their LBs are just that broken when you have the ability to spam multiple of them in quick succession. I'll take the reworked version of PvP over the old version as a fresh starting off point but the balanced team really has their work cut out for them if they're going to be able to make PvP thrive.