Isn't this exactly the same as the Apple vs. Samsung wars? Although those involve patents and this involves copyright, it comes down to the same moral issue. Company #1 starts selling black glass slabs and company #2 clones themm in almost every respect.
At some fundamental level you either think that competition "should" involve innovation and/or original design in order to incentivise peopel to create original products, or you think that cloning look and feel is part of the market operating efficiently without artifical barriers.
The Apple vs. Android holy war spans many different devices, user interfaces, brands, packaging methods, and advertisements. Some Android phones copy the iPhone/iOS more than others. For example, I feel that the Galaxy S1 absolutely tries to copy many key aspects of iPhone and iOS, down to the device appearance, UI appearance, packaging, and marketing (in terms of visuals). However, I don't feel that many other phones (such as the Galaxy Nexus) resemble the iPhone to the amount that Apple wishes it did.
In contrast to that situation, this EA vs. Zynga battle is over one specific product, with defined features and aesthetics.
Copying the many trivial details of a game down to specific color values is not the same thing as sharing a gross physical resemblance to a piece of glass with metal on the back and a screen with a grid of icons.
It's about as similar as a fish is to a bicycle.
Apple are showing themselves as patent trolls - noone else is allowed to create a smart phone that has black glass and rounded corners, which is about as generic as you get.
On the other hand, if you read the link above (the complaint), you will see that detailed feature, after detailed feature is copied (colours, layouts, mannerisms, interaction, selection screens, even the exact RGB colors of skin on characters). This is a complete clone superficially and in detail.
I have lost a lost of respect for EA over the years, but they deserve to wipe the floor with Zynga over this case.
One caveat - Samsung clearly copied the phone icon (although this was obviously taken from the keypad of existing mobile phones), packaging and connector from Apple. This is more obvious, but -FAR- less significant to the product than what Apple "borrowed" from Sony/Jony.
At some fundamental level you either think that competition "should" involve innovation and/or original design in order to incentivise peopel to create original products, or you think that cloning look and feel is part of the market operating efficiently without artifical barriers.