I think some of your assertions are simply incorrect (low light sensitivity, you omitted the 1080i mode, if you don't like the touch screen you can use the rear controls just as you did with the GH1 etc.) or embellished. That could be why you feel the way you do.
True about the touchscreen and I have no trouble using 1080i 50i or 1080p as I dont use 24p (I prefer 25p) but I stand by my lowlight claim..the gh1's iso increments are screwy but in a good way.
Banding is a problem for GH1 for example...you dont get that with GH2.
However im one of the lucky folk who have next to no banding with iso800 on my GH1. And I wasnt THAT impressed with the high iso from the GH2.
I gave the GH2 a go felt it didnt give much more for the extra cost on top so sent it back to amazon...money can be spent better elsewhere.
But thats just me ;-)
I was also going to say that the battery change is a major annoyance...but thats said by others already.
Panasonic will be changing lense mounts next.