You guys must have a very different 6300 than I do. Although it is not perfect in every way, I simply love mine. I find it to be incredibly refined with very few flaws. Of course I am running the latest version of the firmware (v.5.5) and mine is unbranded. I think that might make a difference, especially if you are running an early buggy firmware version. Also, I don't use the voice dialing function at all so I can't comment on that. It is true that many people have reported problems with that function, however, I haven't had any need to turn it off or deactivate it.
Of course it would be better if the phone had more internal memory but I haven't found that to be much of a problem since one can expand the memory up to 2 gigs with micro SD cards. The 6230i's expandability I believe is limited to 512 meg if I recall correctly and its screen is pretty bad to put it mildly. Anyway, I simply store and move most apps and everything else I can over to the card memory, thereby freeing up as much internal phone memory as possible which leaves me with over 3 megs free internal phone memory. Hasn't caused me any inconvenience yet, although I imagine if I tried to transfer a file larger than 3 megs via bluetooth to the phone, that might not be possible. I don't see that as being a major problem though.
There are so many things that are new, different and BETTER on this phone compared to older phones (even the 6233 which is not that old), that I really love. For example, the fabulous display that displays 16 million colors and about 14 lines of very sharp text in Opera Mini, and that doesn't turn off too quickly and can be read when the back light is off; the cool flashing notification lights that alert you to unread messages, missed calls, voice mails, unviewed reminders, etc; the way the radio auto tunes itself to available stations; the ability to have flashlite animated wallpaper and screensavers which allows for the display of some great stuff, for example, a variety of nice large animated clock wallpapers (available for free download from the web); the way almost every menu and function is so much more refined than on previous phones; the solid stainless steel case and slim form factor; the overall great build quality (except for the rattling power on switch, which is a very minor issue); the standard mini USB connector, (instead of the horrible proprietary pop port); and I'm sure I could think of more things but these are just some of the things that occur to me quickly.
Try browsing the web with Opera Mini 4 beta 3 on the 6300. It is just amazing what that little screen can do.
Currently using 6300 & 6233 (backup)