Nice thread. I'd like to weigh in with my opinion.
I have found that any decent laser mouse works as an effective gaming tool. I've known players to use old school Microsoft Intelli-point mice and absolutely raked the competition. Whatever your peripheral is, if you use it long enough, you will be a master of it if it meets your basic comfort requirements. "Gaming" mice do not equate to better performance.
I've used a variety of gaming mice from both Logitech and Razer. I could see where some might prefer one over the other, but both were great at being mice. Personally, I was a DeathAdder fan due to the ambidextrous design. I use a claw grip on my mouse. I want something that is equal in size at all points, otherwise a claw grip is distributed unevenly. So, that is my requirement.
Aside from that, I decided I wanted on the fly DPI switching. If I'm doing some photoshop work, being able to macro a key to knock my DPI down to 400 for precision manipulation was essential. However, gaming mice often feature teflon feet and mouse pads that provide exception glide. I disliked this feature. Having a mouse pad that "sticks" a little bit as a move the mouse across it reduces micro movement errors. I found the same to be true for gaming, where a little bit of friction allowed me to have greater feel of the "road" and end point for my pointer, whereas an ultra slick surface provided no tactile feedback, as though I was on ice.
My point is this; no matter what the long list of beneficial bullet points is for a product of this nature, it doesn't mean you are supposed to adhere to them, or that they will make you superior. Knowing what works best for you does, not what someone else tells you should.
To that extent, I've found the Roccat Sensei [Raw] rubberdized mouse to be perfect for my needs. Ambidextrous design of ample weight and size, on the fly DPI switching, two buttons on both the right and left side of the mouse provide back and forward arrows for browsers and additional macros, as well as additional commands in games directly from the mouse. A five button mouse is my minimum requirement, and this one has eight in an unobtrusive, equidistant design.
The best mouse is one which helps your workflow and disappears into your usage as an extension of your limb, not something you are trying to wield.