I would love usable widget pane, I still think those Longhorn concepts of sidebar were great so I decided to give Widget pane a fair shake.
But it annoys me to no end that widgets do not open in corresponding apps but in new Edge window (or tab if it is already opened).
It seems like the most obvious UX choice to open Weather Widget in Weather app, news articles in Microsoft News, Sport scores in MSN Sports app and so forth.
Even better option maybe would be for them to expand into Widget pane without opening any app.
This way it looks just like a glorified MSN feed (which suppose it actually is).
I hope they fix and change that, but that hope is dim.