Well... first off, the lack of anti-aliased fonts and graphics makes it rough on the eyes.
Can't copy text. The source URL is munged up (missing underscores and a line-break hyphen!)
The data export mechanism is very poor. Hover - not click - on day. Click little table icon. Click 'underlying' tab. Check 'Show all columns'. *Then* download. Repeat for each day. Far too painful.
The whole thing is squeezed in to a 500px column. Lots of scrolling.
'Today's overview' wastes a lot of real-estate and is overly-complicated. A bar chart would explain these figures clearly enough. Or perhaps just a table, with relative percentages.