I'm not sure about everyone else... But I have BOTH wireless & wired gaming mouse.
I have a Logitech MX (i think 700 series, its at home and im at work) Wireless mouse that I bought in 2003. The mouse has been put through COUNTLESS hours of gaming, and computer use (over 5 hours a day). I still have the orig batteries that it came with and they still hold a charge that lasts if I keep it off the charger for 3 days. I have had ZERO problems with gaming!!!
Great battery life (has NEVER died on me)
no side scrolling mouse wheel
I recently bought the logitech G5 gaming mouse ( Newegg.com - Logitech G5 2-Tone 7 Buttons 1 x Wheel USB Laser 2000 dpi Mouse - Mouse
) for my laptop. I can tell that it is a little smoother on the same surface than my above wireless mouse, but I really cannot tell a difference side by side except having the annoying cord in the way, and the sideways scrolling mouse wheel. The G5 has weight adjustments, but its prettymuch the same weight as my wireless mouse.
Very Smooth on surfaces
Mousewheel with sidescrolling
Wire seems to get in way (like any wired mouse)
Wire seems pretty stiff, and not plyable
To sum it up both mice work wonderful. I am an avid gamer for FPS, strategy, RPG you name it... I CANT TELL A DIFFERENCE! I would have personally bought the G7 wireless mouse, but it made me so mad that they dont have 2 buttons on the side like my old mouse and g5.