I knoe a few people who don't like their iphone. When they see my n900 they are usually impressed."woah, you have 2 things going at one time, wtf"
The fact that there are not many online complainers is probably due more to iphone users not being able to find where to, or how to complain.
Either because of: the limitations of the device; they cannot be bothered to cos '"t's just a phone, I don't really care what else it can and can't do"; or because, dare I say it, the limitations of the user.

The comment about apples' demographic is a good one, they know how to sell stuff to people who just want a 'force fed to dummies' sort of device which they don't need to think much about or do muvh with.