If a game is 'broken' in some way, I can see the need to attempt to change things to fix issues. However, some very successful games hurt themselves when they change the mechanics of the game instead of just adding content. Two that I can think of is SWG and WoW. Both seem to have seriously hurt themselves by deviating from their successful model. I'm sure there are others than I'm not thinking of, but those two seem to be the biggest that I can think of.
As the old saying goes, 'If it Ain't broke, don't fix it'
Concentrate on enjoying yourself, and not on why I shouldn't enjoy myself.