I'm assuming you just started or recently just started? I was going to say the worst part is the Main Story Quest grind between A Realm Reborn and the HW expansion. There are like a 100 you have to slog through before unlocking HW and 75% of them are "go here, come back, go here, come back". The finale to ARR is pretty awesome, though.
PVP is pretty crappy if you like PVP...typical MMO crap with you being stuck on a team that doesn't know wtf it is doing most of the time and healers being OP as fuck.
As an advanced housing user, I would also say the furniture item limit pisses me off. I have a mansion and you're capped at 400 items inside (200 for small house, 300 for medium). That sounds like a lot, and it is for many people, but if you use any advanced techniques/housing glitches and want stuff to look professional, that limit is way too low. My basement sucks because I ran out of budget and I'm trying to figure out a way to make use of the space in a way that doesn't look out of line with my other floors. Also you get soft capped at 40 interactive items. You can have more, but then they start phasing out of existence if you step like 10 feet away, which ruins the potential of the blank partitions. Most of that is the result of them needing to support the Playstation users and the shit RAM you have on a console (since PC and PS4 crossplay in the game).
Other than that, though, I love the game and haven't really touched WoW since last year. There is a lot of stuff you can do. They even cater to the Everquest/FFXI crowd with the new Eureka zone (ie, XP loss and takes forever to level grinding hard mobs....mind you the XP loss is a seperate level pool just for that zone, it doesn't impact your character outside that zone). Crafting/gathering in this game is pretty awesome and I've actually spent more time leveling those than combat classes (I've pretty much only done monk and samurai to 70, primarily because they share gear outside the weapon). You can make some serious bank with gathering/crafting, even at low levels. Plus it is pretty interactive and takes a lot of strategy for certain items if you want the item to be high quality. Raiding is good as well, although slightly different. Most of the hardcore raiding objectives are 8man ultimate/savage versions of the normal versions. I haven't done many of them, but the mechanics can be radically different than the normal versions and can be pretty heavy gear+skill checks. There are also 24 man raids, but those don't have any hard versions and are mostly a way to obtain some decent "catch up" gear depending on how recent they are.
There are also more casual pickup raids like the "mark" trains (people basically all group up and kill a bunch of world spawns in order to get special currency/materia) and you can do smaller groups for treasure runs as well. You can harvest treasure maps with a gathering class and for the HW+SB Dragonskin and Gazelleskin maps, they have chance of unlocking a 7 level dungeon where you can get some very valuable items and lots of gil. Plus for SB, you can also get a rarer treasure map inside which unlocks a harder 7 level dungeon and if you get to the final floor and beat it, everyone is guaranteed 1,000,000 gil each (not counting all the items/etc that drop along the way you can sell). The treasure dungeons have a lot of luck involved, though. After you beat a floor, you have to pick a door. If you pick the wrong door, it activates a trap and you get kicked out instead of going to the next floor.
