Don't play this game! really don't. Because it's a pure waste of time.
If you like it you are probably already addicted.Because when you think about the game you understand that it is nothing but a waste of time, addiction keeps you from thinking.
Now, about the game.why it suck you ask?
Well...
About storyline, there aren't any.Literally.None.
Graphics, Well I don't care that much about graphics, as long as they are not ugly and they're really not in mu. But, If you care you probably won't find them to good even for 2003 year game.Plus it has an isometric camera and you can't zoom or change the view.
Sound...mhmm...the sound, well there's almost no background music and in the rare places there it is it just plays over and over again till your ears start to hurt.There's also some crapy environments sounds which are more annoying then satisfying.And there's also mobs and weapons sounds which actually sound pretty cool the first few days.
And the gameplay, the ultimately worst part of the game.
First of All Leveling...ah, mu gives the word "grind" a truly new meaning.The monsters in this game have absolutely no AI, no spells no nothing.And the so coled "bosses" in mu are the same as all others just with different skin and more hp, so it doesn't matter if you fight 100 mobs or 1 it's all the same.And you know what's the worst part? you level and level and level to nothing, there's no endgame, no battlegrounds, no dungeons, no world/mass pvp, mu doesn't even have the end, you level up till certain level, when you reset your level and start all over again with more points.
Now about PvP, i don't even know if it can be called that in mu, because your charter (there's 3) have ~5 spell's and you use only 2 of them one in pvp one in pve. All the PvP consists of you killing (mostly one-hitting) the lower level player or you being killed by higher level player, oh and there's absolutely no point in killing someone 'cause it's neither fun or rewarding, you don't get nothing for pvp'ing (except for red name and being stuck in one zone till your name goes blue again).
PvE isn't by a bit more fun when PvP as i mentioned above you just kill dozens of mindless monsters and level up (to nothing) they drop all kind of loot which doesn't get your day any brighter because you won't use 95% of it.Plus you will constantly find yourself and everyone else being afk 'cause all it takes to level up is holding your right mouse button pressed (and of course people find many ways of leveling while being afk)
You may think i'm just trolling here because i didn't listed any good points of the game, but when you think about it there's hardly is any without it being an mmorpg.