Maplestory?

Ive been hearing a lot about this Maplestory game, and I was wondering if anyone had a real opinion on it.
I decided to actually try it, but I want to know if its worth like 7 gb of space of my computer, because i dont want to download it if it sucks or if it could mess up my system.

So If anyone has an opinion on it, please tell me, cause Ill probly be breaking my computer if its aggrivating and hard.

Peace, Cricket loves you