Yeah, the types of problems we had (I sort of wrote about it elsewhere[1]) were just totally inexplicable. I forget the precise specifics but one of them was something along the lines of things that would work one day but not the next, etc. Just really wild stuff that made me have no trust for the reliability of the platform.
Edit: The "best" part, if you follow that link, is that the project I mentioned that ended up cancelled would've had to be rewritten anyway now that FBML is on the way out.