There will always be a divide on this one!
I personally have an auto and love it, the flappy haha aka tiptronic box works fine for me although I tend to drive in A/T mode almost everywhere, there is an pause from putting your foot down to the V6 really firing up but once it goes, it goes...I find personally for me it works through the gearing lovely.
Alex on skyline-owners-club.com has a M/T and it is a different drive, not better just different. I guess its all down to personal preference...............