I am also going to say that tiptronic auto is not that bad for an R34, having one myself I have not been disappointed yet. Sure the arguement lies that manuals get more power, control and 'fun' but I think the tiptronic is not very far off.
The shifting arguement is void with tiptronics as they can do pretty much the same thing - except launches. I guess an extra bonus to tiptronic is that they can downshift a hell of a lot faster than manuals.
As zymotic said, it's bliss knowing that you can choose between lazy mode and semi lazy mode! Comes in handy when the girlfriend is there