I feel like this game's PvP has a lot of potential, but a lot of it is an afterthought.
The concept of Frontlines, for example, seems to work on paper, and once catered to your Grand Company choice. Now, you get cycled between the Grand Companies, defeating a part of the purpose.
In terms of game mode balance, SE has to alternate between catering to 5v5 CC, 24v24 RW and 24v24v24 FL. The issue is, your abilities are consistent throughout all three of them. A great example of this is AST's Macrocosmos. It's somewhat powerful in CC, but FL lets you stack jobs on a team, and combined with DRK, which can snare teams, you can get hit by 3 or 4 very coordinated Macrocosmos, which can tear teams apart. Because SE caters primarily to CC, this makes FL extremely unbalanced.
This isn't even addressing getting "pinched" by two teams. Quite frankly, having three teams doesn't even make sense. Basically all battles in warfare are between two sides. If this is trying to make the player feel like these are wargames, they've failed miserably.
In terms of individual class balance, some of the classes with unbreakable CC moves (especially MNK) and classes with quick takedown mechanics (especially SAM and NIN) can be exceptionally infuriating to fight against. Some maps have obnoxious players who spend the whole game getting knockback KOs and doing literally nothing else. I get most MMO PvP content isn't well balanced, but there's a lot of decisions that were made that I REALLY question.
My final grief is the maps. The maps in FL, for example, all kind of more of less feel the same. Objectives pop up, secure objectives, fight enemy teams for objectives. RNG is very often a factor in winning, which is not fun. I get they're trying to make the games feel consistent, but it'd be much more interesting to see maps that REALLY felt different from each other!
These are just some of my major criticisms. A few minor ones to top it off include:
-RW is extremely neglected
-Only three PvP modes (plus dueling in Wolves' Den)
-Games always feel short
-People literally queue just for XP and do the bare minimum or just AFK
To reiterate, I do think this game has a good amount of PvP potential. However, I'm really not convinced things are gonna get better, not for a while.