I would like to chime in on both games and music, since i do both as well.
I've been playing guitar and drums for about 20 years. I have been in COUNTLESS bands, one of which took off ( not famous but known locally and in a few states) and was together for 6 years. The one thing i tell musicians is to be true to themselves. No one has a single unique thought, its more about taking things that exist, and putting your own flavor to them. It's hard not to sound like someone else... becaus music has been around for so long. The thing that makes you stand out is what you do differently with what's already there.
The same can be said about games. I play and have played lots of games... lots. I generally focus on MMO's. What makes a game isn't what it does that's new, really... because 9 times out of 10, new ideas tend not to work out. What makes a game is improving on existing ideas and making them feel new. I'm with Connor on this... if we look at every game objectively and independently. .. we can see what it has to offer that others maybe don't.
I loathe people who constantly compare everything to the 1 thing they play. Of course there are going to be similarities, because if it works... why fix it. There are certain things that are staples in MMO's.. so not to have them handicaps your game. For instance; People continue to compare every new game to WoW, which is fine, because WoW did alot of things very well... but nothing in WoW is new... at all. It has existed before, and will continue to exist in the realm of MMO's. They just borrowed from past games and put their own spin on it.
We just have to be open and objective when playing games/listening and/or playing music. The reason i can enjoy many games and enjoy playing many different styles of music, is because I can see each genre for what it is... and stellar progression of ideas built upon ideas... from which I can build upon myself and make a mark in the progression.
just my 450 cents.