Just like the recent letter on pvp adjustment said, the developer team is too focused on the shiny new Crystal Conflicts, a small-scale 5v5 arena, that Frontline, a 24v24v24 suffers from imbalance between classes.
Biggest problems that I observe during my playtime:
-Summoner's Limit Break: the biggest problem. Assuming both team is equal in skill, it is pretty much all about who focus-fire their legions of Bahamut first to kill a lot of another team's members to rack up Battle High, resulting even stronger Bahamuts next wave. No one use summon Phoenix, btw. In addition, both enemies and allies' summon have the same colors, so it is kinda hard to know which one is safe to approach post-drop.
-White Mage's Limit Break: help stun enemies' summoners so that your summoners can do the Bahamut drop. Two or more focus-fire WHM is pretty hurt and can finish off/let other people finish off dying enemies who are still be stunned.
-Scholar's DoT: scholar can rack up Battle High with their wide-spread DoT. It is rare to see a group of scholars compared to WHM and SUM, but when they do form a group, they climb Battle High fast, resulting very devastating on enemies side with their un-cure-able mass DoT.
-Paladin's Limit Break: call it smart play or imbalance depend on your mood, but PLD's LB is very strong in Oovo capture as you only need to capture the flag once. Basically, PLD cast LB and use Cover on a flag-capturer will make both immune to damage, and that capturer immune to all interruption. The duration lasts long enough for the flag to be captured, making it is possible to capture a flag that is already surrounded by enemies with only two people.
Altogether, you tend to see a frontline with a lot of WHM, SUM, and a few other classes. It boils down to whoever use their LB better and sweep in to deal with a half-killed force.
I think most of those above problem can be fixed by:
-Making all LBs only affect 5 target at max, or the damage on surrounding target has less potency
-Same with Scholar's DoT.
-Color-code summons similar to Sage's LB barrier drop. Need more red Bahamut/blue phoenix
-Also make Phoenix more useful in flag defense. Regen and reduce damage for nearby allies, for example. I have an interesting idea: upon Phoenix drop, it heals and make nearby allies immune to damage/status effect for 2-3s (which will put a debuff that make you not able receive the immune buff for 10s to prevent spamming), which can help to cover retreat/bolster defense against focus-fire if use strategically.
-Not sure if PLD's capture-the-flag strategy it should be kept or should go away. If go away, perhaps PLD's LB should has less charge time instead. Or add a mobile Passage of Arms so that he can bolster defense for people standing behind him.
Do you have any other suggestions?