I see I edited out from my first answer by accident that I see mostly happy people with a grainfather. And it seems like a great buy.
Every brewer has different needs. I like to chose components myself. For instance many people report that the pump or filter gets stuck when doing very hoppy beers, I use a march pump which never gets stuck, and don't need to mess around with a pump filter. I like to be able to tweak how my PID performs (not just calibrating it), I want a WP port, I don't want to lift the grain-thing, I want an immersion chiller (can add one, but why spend money on something you don't want). I want a temp-probe in the middle of the mash tun, and not on the bottom, and not a probe which can be covered by scorched stuff or hops which will make it read wrong temperature. If the thing breaks down I can't brew on it. If of of my components break down I just swap that piece out, or brew without it.
There's always some sort of "workaround" for things that doesn't work flawlessly, but then I'd rather build a system which doesn't need much workarounds, it does as designed.
Basically, I want a different system than a Grainfather, as it can't do what I want it to do, like said in the first post.