Premades vs PUGS aside, BA has a lot of technical issues going on with it right now
1.) Every enemy has a debuff limit of 60. This causes issues if your party has a lot of DoT classes (SMN and BRD) as some of the trash mobs requires silence/stun/sleep to interrupt a deadly ability. If it has too much debuffs up you can't interrupt it as silence/stun/sleep takes up a debuff slot. You also can't put Feint on AV which is required if you don't want half of your attacks missing
2.) Even if you didn't reach the debuff limit, there are times when the debuff display is bugged and won't show your debuffs on the boss even if it landed. This issue persists even if you turn on the settings that only shows your debuffs and makes it really hard to keep track of your DoTs. This makes SMN and BRD really awful to play as you won't know if/when you need to refresh your DoTs
3.) Last but not least, culling issues. If there are too many players/mobs in the area, the game will choose to make some things invisible. The problem is the culling priority is really messed up and can cause things like the boss,adds or even aoe markers to be invisible. Player ground AOE effect such as Shadow Flare/Salted Earth apparently counts towards this limit as well as player pets/turrets. Example of the AOE marker being invisible:
https://twitter.com/mist_llDX/status...42680310943744