I know what you mean, Syren.
I've got a N95 8G, N97 and N8. Though the first and last phones are the better and the last one the best, I find the GUI perfectly fine.
I've played with iPhones and found that while the glitzy bits are nice, the hardware is quite ordinary when compared to the N8, for instance.
There is some bling on the iPhone3/4 that looks nice, but this doesn't make it a good phone. It makes it a nice UI.
An upgrade, if done well, to the GUI for the Nokia's would be nice, but I don't find myself hampered by the UI to be honest. I do find myself hampered by the iPhone (and others, for that matter) having such ordinary specs (eg. ordinary camera, flash is either not present or just plain ordinary, no HDMI output, no USB on the go, no FM transmitter).
The current review seem quite okay, until they start to make iPhone comparisons.
Each time I put my N8 on the desk and people compare it to the iPhone (4 included) the only thing they come away with is that 'it's got more bling/glitz' and there are some apps which are not half bad. The browser is REALLY crap and, as I've said, the hardware is generally pretty ordinary when stacked up next to the N8 - hell, the iPhone4 can't even do proper (3G) video conferencing.
In summary, the iPhone has major limitations in its hardware which are (for some people) covered up by the Paris Hilton factor - lots of glitz but not much else.