This is a long-term issue.
This widget strips out the theme CSS, and displays in a very un-ordered way.
Are there any fixes that will at least position the feedback messages & the User Count on separate lines from the Title (!), let alone matching the Widget title display to other theme widgets.
Hope the Jetpack gurus can clean this up quickly. Now that Feedburner is no longer an option, I am sure that this feature will be very much in demand.