I suspect there are as many reasons as people voicing them. As for me, i started out as a big Android fan last year when the G1 was being released. It had a few too many limitations to make me bite.

Then, i watched the hardware for it fail to improve for an entire year. An entire year, in the smartphone world! "Not Android's fault", many will say. Well, that's not entirely true. Only the most recent release will support something besides the truly anemic resolution of the G1. For all i know there are other underlying software barriers, too.

But more recently two things have really changed my opinion about Android. First is the fact that for all the talk about Android being the open alternative, and the Linux phone, it's really not open in the way that your average Linux distribution is. Android is basically an application layer on top of Linux, and to really add to it in a meaningful way, you have to work within the constraints of that layer.

That extra layer of abstraction has the extra nastiness (again from my own perspective) of being modeled on a Java virtual machine. I hate Java. I've never seen a good app written with Java, but i've seen several bad ones. My experience programming in Java was also mostly miserable. It was years ago; i'm sure times and Swing have changed, but there was some component of the GUI that wouldn't work on every platform. On Irix (or linux, can't recall), it was the progress bar. On Mac, it was something else, and on Windows, yet a third element. What a mess. So much for "write once, run anywhere". If you remove that supposed capability of Java and throw in the silly moves Sun has made to keep control of its baby, it really has nothing to recommend it in my book.

Finally the real cold shower is the realisation that Android is nothing without Google, and Google is keeping its cards close. They were within their rights in sending the C&D letter to the Cyanogen mastermind--but that the need to do so arose in the first place is a symptom of the problem.

I don't want to keep all my data in the cloud (Google's or anyone else's). Sync capability is top priority, but if a mobile computer can't stand on its own, it's worthless to me. That doesn't fit within Google's (and hence Android's) paradigm.