Combat is flashy, but it's really just a button-masher. There's no need for any tactical thinking or decision making, or anything to make one fight different from the last.
The world is big and pretty, but there's nothing to do in it except a bunch of quests that amount to 'go kill 5 wolves' or 'go talk to the next NPC in the chain'.
Endgame is a whole lot of grind for upgrades so small that they have no noticeable impact on your time to kill anything, making the whole effort feel like a waste of time.
Far from the worst MMO I've played, but hardly one I would recommend either.
I feel like this description begs the question... what's the worst MMO you've played?
If we're only looking at F2P that I actually tried (however briefly) and wasn't bogged down with technical problems...
I don't remember the name of it, but there was this kMMO I came across a few years after Ragnarok was around with built-in integration to literally like fifteen different social media sites, used that godawful Asian font (that skinny monowidth serif one that makes SimSun's western characters look like a blessing), built in almost complete botting (auto-quest, combat, gather... about the only thing you had to do manually was level and equip stuff), and gave you a free infinite-use 100%HP/Mana pot for your first few sessions. Despite all that, it wasn't actually meant to be an idle game or one of those glorified interactive chatrooms. The graphics weren't bad, if you like Ragnarok-style aesthetics, but they were also a step down. It was pre-mobile so it wasn't built for that market, and, oddly enough, there was practically no cash shop.
It was actually pretty entertaining as a screensaver, but as an actual game... just...
why?