I think I've had the same pair of batteries in my wireless mouse since I bought it half a year ago. At least I haven't changed them more than once.
I don't see what you mean by "a pain to install"; I just put the antennae into the usb port, and I was pretty much ready to go. The only one of your problems I can relate to is that it goes glitchy sometimes, but I only use my laptop for browsing the internet or writing word-documents, so it is not really a huge problem.
If I were to start gaming on a pc though, I would definitely want a mouse with a wire.
Edit: From what I can see in this thread it would seem that people have very conflicting views regarding the objective, measurable, qualities of wireless mice. My guess is that the people who are complaining about wireless here have at one point bought a really crappy product, and those who praise wireless have been lucky and bought something good. To summarize, it would seem that the differences between products on the wireless market are so great that one product can turn anyone into a wireless-lover, and another can turn anyone into a hater.