Class/Job System- is boring, lacks creativity and depth because they built it around casual player skill oversimplifying it instead of building the system around the potential of the class/job.
I was never one to have time to level 10 characters in one game, I RP so I make a story for my character but being able to play all jobs is nice.
Combat- oversimplified and lacks depth there are no crowd control abilities, not a lot of support abilities and no skill chains.
I would like some more abilities that are needed but not in every fight. Like Silence for my BRD would be nice if it was more useful.
Zodiac Weapons- takes to long for the casual player to get for very little gain. At ilvl 110 it should take a max of 3 weeks for a player to get if they play 2 hrs a day since new Raids and gear come out every 6 mos.
I personally like the pace I am getting this done. Just starting on Alexander farming this week.
Raiding- has a lot of one shot mechanic and is unforgiving because if one player screws up he or she can wipe the entire party
I will admit, One Shot is cheap and needs to be removed from the game, I'm all for gating with DPS check, Healing Check, Tank check, But one shot sucks because it often has nothing to do with skill of player if there isn't enough reaction time for player to move. And this being the internet, You need to account for lag times which for some will be more then other.
Weekly Lockout- Players can down T6-T9 on a weekly basis and not get a single loot drop for their class. Players wouldn't mind a weekly lockout if one piece of loot dropped for all classes
I personally like how this is gated. It prevents to much of a gap between Elite players and the rest of the player base giving them a reason to help out. As long as they haven't done there turn 9 yet.
In general anything worth getting in this game is a long boring grind for very little reward if something is going to be a long grind it will have to be the best item in the game until the next expansion.
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I don't think something that is a grind between Major patches need to be the best item till 3.0 It need to be the best item for 2 major patches.
So I only agree with one of your reasons also I don't see anyone of these one things breaking the game so someone leaves over it.
I've been playing MMOs for 12 years. I've quit all of them before FFXIV, Why I don't have time for 2 MMOs.
Also the grass is greener on the other side of the fence is what I personally thing is the biggest reason people try another mmo, some come back some don't.