In order no, yes, and it can be.
In depth, no, it is not good for gaming, because Windows has such a corner on the gaming market that very few good games work with Linux. You can try apps like Cedega to get Windows games to work in Linux, but you're taking one larged sized risk there. Linux in general is better than Windows because it tends to be faster, more customizable, and more secure. As for it being faster, it can, because you can tailor the Linux kernel and modules to your computer, making load times either faster or slower, depending on what you have installed and loaded.
