Mr Fish
Slippy sloppy, The
The good way of "hey, they did that! Let's do that too!" is when it is actually relevant to the game they themselves are making. For example, the first game that introduced iron sights, the first that introduced a sprinting mechanic, the first that introduced a grenade pathing system, these are things other FPS' could adopt as it could enhance their own FPS mechanics. And that's fine. If you're aiming to make a certain type of game then copying what others have done before that is successful to bring out the most out of FPS mechanics is fine. You're learning from others. Adopting what they created.
The problem of "hey, they did that! Let's do that too!" is when game B is doing something that game A has no reason sticking its nose into. Adopting successful ideas to bring the most out of certain genre's is a good thing (which is why I find it baffling that so many other cRPG's ignore the good stuff Fallout 1/2/T has done). Adopting mechanics that don't suit your genre in order to appeal to a broader base is a really bad thing.
The problem of "hey, they did that! Let's do that too!" is when game B is doing something that game A has no reason sticking its nose into. Adopting successful ideas to bring the most out of certain genre's is a good thing (which is why I find it baffling that so many other cRPG's ignore the good stuff Fallout 1/2/T has done). Adopting mechanics that don't suit your genre in order to appeal to a broader base is a really bad thing.