City of Villians is a very fun MMO where you play the villian.
This MMO gets rid of the repeditive "grinding" to increase a skill (doing something over and over again just to level up) instead you go on missions to earn points and spend those points where you want.

There are little things you need to do in order to gain specal abilitys.
If your on a team when your leveling up and it's time to pick a new power you can unlock a new specal ability instead of picking a power based on your characters type.

My character is a tech mastermind. I unlocked the power of flight :) Now he can fly everywhere. Very slowly. He actually got hover not flight but ehhh it gets him over walls and on top of buildings.

Plus it gets him out of reach of enemys who can't fly. and rain down death from above.

Anywho recently they added support for a new chip. This altered the way the game engen worked significantly enough that they had to compleatly rework the game.
For a while the game was compleatly unplayable and even now there are unplesant side effects.
Those changes were NOT tested before added.

Lesson here,
If your running an MMO you do NOT compleatly remake the game engen.
You do NOT compleatly change the stats.
You do NOT implement anything you haven't tested on the test servers first.

Failing to do any of this you risk pissing off everyone and screwing over gammers who are paying a monthly fee.

If your going to screw existing users then make a FPS or statagy game or anything where the players aren't playing a monthly fee to play.

If they are paying monthy then add new content and fix game engen do not revamp the whole thing unless your planning to make a new game.

Well they do say that the online game could change at a moment notice, or something along the lines.

Yes however the changes they made broke the game and it was only just getting back to a playable state when it was time for me to renew my membership to the game.

So I didn't.