I understand your frustration, but to play devil's advocate: I just don't think you can ask an iphone or ipod touch to do email like a blackberry, game like a DS, organize like a PDA, take pictures like a point-and-shoot nikon, surf the internet like a netbook, and guide you like a Garmin. Oh, and be an ipod.
Don't get me wrong - apple bills it as being able to do email, play games, organize, take pics, surf, navigate, listen to music, and more (you can take out a couple of those on an iPT, but you see my point) - and so it does. But I don't see how anyone could make a single fit-in-your-pocket device that replicates the functionality of a half-dozen well designed and relatively expensive stand-alone devices.
Now, in the case of your calander complaints, the fixes are probably not as hard as I'm making them out to be, and I bet the iPT could in fact become a true PDA replacement. That's a great goal and something that Apple should strive for. But TJRiver is right: the iPT has never been touted as a PDA replacement. For now, the iphone and iPT are jacks of all trades, masters of a few - and that ain't bad.