A slower sensitivity also means that it is more difficult to turn around ingame. more room to aim on a large mousepad (40cm wide e.g.) means more accuracy than moving your mouse in an area which is as large as a stamp. Most important thing here is: sensitivity is personal preference, but there are still some things to say: disabling enhanched pointer precision / mouse acceleration is preferred by most gamers. I've noticed that having a thicker pad (>=4mm) can provide a better feeling, if the surface isn't 100% plain. The size is depending on your mouse sentivitiy, a bigger pad gives you more room to turn around and stuff. There are mousepads made of cloth, plastic, metal or glas available, but the most good players prefer cloth. Using a mousepad makes your movement smoother and more constant. Many mice in a price range from lets say 25-60 € fullfill these requirements! It mostly is personal preference, but if you are interested in further information, you can find lots of details on the internet. One point to look at might be something called 'prediction' or 'angle snapping', basically something build in to smoothen your mouse movement. Feeling comfortable with the handling is the most important thing. Addition thumb buttons are also a nice feature. Adjustable polling rate is a plus, 500 or 1000 Hz do a good job. In my opinion, you don't need a higher dpi range than ~400 - 2000.

It shouldn't be a ball mouse, so optical or laser is the way to go. Unlike advertising tells you, it is not necessary to have the highest dpi, fanciest colours or most mouse buttons. The mouse is the most important thing to look at when playing shooter games.

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