From what i've experienced as a novice and what me friend who mains it say, the issues we find are;
- ghosting is still very much a thing that stupidly got put on Sch too,
-Bahamut and Phoenix still wanna hug my booty despite having more than enough range to be stationary upon spawn location and be hitting any target,
-is too strong for what it has,
-has excess buttons for pointless things eg Dreadwyrm Trance and death flare as seperate when can't do latter before former,
-is constantly being changed too much every expansion to then be re-looked at and subsequently buffed too much (2nd expansion in row will they go a turkey with 6.0 :P)