if you have to ask if its a gaming laptop its not a gaming laptop. Most laptops today aren't built to be power houses. In fact unless you go into the laptop market knowing what you really want you will often over pay for an under performer.
If you want a Laptop that will play games this is really what you want and keep in mind if you get these items in it your battery life won't be great.
Intel core I7 Processor (the faster the better)
6GB DDR3 RAM or more (make sure the O/S is 64bit or you won't see the memory)
Dedicated graphics card (or dual graphics capabilities)
Some PC's have an Intel integrated graphics processor for running the O/S with the ability to switch to a dedicated graphics card for high end needs, this is perfectly fine too.
Graphics Cards are the core of what games need to run properly. In simple terms they draw the images you see on screen and HD gaming has a high demand to draw the images properly.
Good gaming laptops must be core purchases and never an after thought.