The worst thing about wow clones is:
Skill rotations:
> f1, f2, f3, f4, f5,
> f1, f2, f3, f4 (f5 not ready)
> f1, f2, f3, f4, f5.
Constantly press those buttons in rotation over and over and over again on cooldown like a trained chimp, literally endless rotations. Some of them (they all pretty much copied it off each other) try to add a little extra "gameplay" to break up the repetitive busywork by adding "ooh no! get out of the red telegraphed area player!" but that's stupid pointless garbage too.
Second worst thing about wow clones is the world is completely pointless, you can sit in town and press a button on instance matcher (almost everyone will do this) and be warped into the dungeon when the 20-30 minute is up to make the party (unless you play tank or healer ofc and then it's 5-10 minutes wait). After you complete the dungeon and get your whatever rubbish you did it for, nobody says anything you leave and....you do it again over and over in a cycle till you log off.
Third worst thing about wow clones is constant gear replacement, every 6-12 months or so they bring out new dungeons with new gear that make all your old gear complete garbage. You literally just throw it away (even though you had to put lots of effort to get it) and jump on the treadmill again to get this all new gear and weapons that again will be made obsolete in 6-12 months again. while grinding all this new gear again you KNOW it will be obsolete in the next rotation, after a while this really starts to grind on you and leads to some people quitting when they cba to start again.
Fourth worst thing about wow clones is the amount of """optional items""", they nickle and dime you over everything and those "cosmetic only" micro-transactions are a lot more predatory than you think they are. You can easily end up spending more on outfits or mounts than the cost of the game and/or the sub, once you're in the matrix those fancy outfits have way more pull on your wallet than you think they do.
Fifth worst thing about wow clones is they have almost no communities and server populations are meaningless (for the majority of players) at all since almost all the content is dungeons and the games have instance matching so you will end up almost always playing with random people from other servers that you'll never come across again and that don't even talk most of the time at all, basically they might as well be npcs cause they don't even say hi or bye. Even if you play ffxi alone you'll still end up being familiar with people from yells or people you always run across going to the auction house etc, you'll still get to be familiar with peoples names. This makes a feeling of familiarity and realism to the world and a feeling of a community in the worlds you play on. FFXI also has far less churn in players, so you're more likely to see the same people even after breaks and you get a really nice feeling of familiarity when you return and see those names again (even if you don't actually know them to talk to).
Sixth worst thing about wow clones is they keep wiping the slate clean and making all new content to do, ffxi builds on content and is always in addition to the other stuff. It's always been like that.
Seventh worst thing about wow clones is quest based leveling, with stupid narrative quests you get from an npc that you never read anyway and are almost always the same boring trash over and over, they are really boring but you have to pay attention just enough to where you can't just switch off and nobrain your leveling (which makes it really damn annoying, far worse than mindless grinding of killing monsters for xp). They force you to move locations as and when they tell you, you go where they tell you and do what they say.
FFXI has much slower gameplay and it's less annoying because of that, it's more fun and relaxing to play cause you're not constantly pressing 1,2,3,4,5 or running out of red circles. It's an mmorpg, it's supposed to be more relaxing and goal orientated (whats the point playing a goal orientated game when they keep smashing up the stuff you work towards with constant gear "progression"?), if you want to mash buttons you can play DMC or something.
The world feels real because you have to goto places to do content, instead of just sitting in the afk spot and pressing instance matching.
FFXI servers have communities, even if it's "oh that guy is a potato", "that guy is a real troll" or "that person is a really good player who makes good groups" or "that person is nice", you really get none of that outside of your guilds on other games because most people do content in instances and don't really need to walk around the worlds.
FFXI has very few micro-transactions for you to get lost in because the engine can't support a cash shop, it still has ways to spend more money than basic fee but it's far less predatory than fancy outfits or mounts on other games so you're far less likely to spend silly amounts of money. If you play ffxi you pretty much know exactly how much you're going to spend per month, this is NOT the case on almost any other mmorpg you can play.
FFXI has gear ceilings, if you put a lot of effort into getting good gear and take a year or two off. When you come back that gear is still either really good or good enough to get the few extra bits you need. Most of the content always remains, so again if you take 1-2 years off and come back people still are doing ambuscade, reisen etc so it's easy to slip back into playing as it was when you played last. There is no massive hurdle of entry as is the case with every other mmorpg that keep on re-inventing the running wheel.
I've played every mmorpg, I always come back to ffxi because of these things and not because of "addiction". The only MMORPG that kind of stuck with me for a while was Tera, I found the action combat really fun but the negatives above killed that for me after a while too.
Oh and above and beyond why wow clones suck, ff14 sucks because in addition to all the stuff above, if you are like me and want to get and decorate a nice house. They will literally destroy it for you if you take a break from the game for more than a few months. They did this because it forces players to stay subscribed even if they don't want to play, because they have to enter the house once a month or it will be on that countdown to destruction. Scummy.