Latest Macbook Pro here and have that same WIFI issue. I still have 5 year old Lenovo with windows 7 on it that is just as, if not more, stable than the Mac.
On Mac things like Alfred (probably will drop this for the new spotlight), better touch tool, some capabilities like ability to swap USB MIDI controllers without restarting OS are cool. Honestly though, performance wise there isn't that much difference between my Mac and Win Machines and being in programs full screen most of the day I notice much difference at all. The really flexible information moving things I've grown accustomed to on Win seem a bit crippled on Mac because of lack of a filesystem.
On Mac things like Alfred (probably will drop this for the new spotlight), better touch tool, some capabilities like ability to swap USB MIDI controllers without restarting OS are cool. Honestly though, performance wise there isn't that much difference between my Mac and Win Machines and being in programs full screen most of the day I notice much difference at all. The really flexible information moving things I've grown accustomed to on Win seem a bit crippled on Mac because of lack of a filesystem.