First of all, I should say that I LOVE LOVE LOVE this phone. I've always had old phones from friends and family when they have had upgrades and this is the first time I ever treated myself to something really savvy.
I had the same experience as someone else... after 24 hours... faulty! I turned it off and when I turned it on again it lit up, gave me the NOKIA advert screen and then totally froze. I was in a foul mood but got a replacement in store the next day.
All is well now, although there are times when it does something strange and I don't trust it. I just turn it off and on again...... which also fills me with fear, but seems to work!
Nevertheless, the touch screen is great, the camera is good quality (but probably not the same quality as your digital camera), it's just really versatile, has loads of options for anything you want to do and has great games.... and mp3 player!! It's brilliant!
So to be honest, I will probably just put up with its unpredictability because it's a great phone (this seems to sum up quite a few people's experience). I have mine insured on fonesafe so if anything happens, my fault or the manufacturers, I will just get a replacement. It's a total pain but I'm a sucker for the Nokia 5800.
Totally understand people giving it the 1 or 2 stars, but for me it's a 4, I would give it 5 if I felt I really could trust it!