I do have some sympathy with you.
I however do LOVE my N900 and yes it has its shortcomings.
Nokia didn't really say anywhere this device for NOT FOR NOVICES, as a lot of people on here say. But then you really have to look at what the device can do and that has to be played out in power usage and battery life.

I had similar Wi-Fi issues etc...but once I reflashed my device, these issues disappeared. Granted however, this ISN'T a solution or answer.
I also agree about it being a proof-of-concept....even though it was NEVER marketed as a proof-of-concept (which would be a sh*te marketing decision if it were). Nokia is a business, they don't care sh*t about US or our views but they are happy to take out money.
Once you get over that point, then the device is pretty much open to your imagination.

Lets hope it develops with the wonderful people on here who find interesting new things to do with the device....but yes, the device is premature and to compete in this modern age of short 6-month technology cycles, it has a hard path ahead of it....

(PS, I must admit that I HAVEN'T ONCE touched my iPod Touch since owning the N900...and THAT is an amazing feat for a Apple fanboy).