If you want to chart values over time or compare values obviously a bar chart or line graph is going to work better.
However these gauges at the top are not replacing a bar chart, as they each only show one value in isolation - that'd be a pretty simple bar chart. When you're showing one value, and at most might have targets to show in relation to it, a radial chart is just as good IMHO, and lets you put other info in the centre (like the figure in numerals for example). The closest tabular representation would be the weekly stats at the bottom.
I think they make a nice compliment to the other graphs on the page, and do not sacrifice usability for aesthetic appeal given that there are other styles of chart used where appropriate (for example the time series of visits etc.).
However these gauges at the top are not replacing a bar chart, as they each only show one value in isolation - that'd be a pretty simple bar chart. When you're showing one value, and at most might have targets to show in relation to it, a radial chart is just as good IMHO, and lets you put other info in the centre (like the figure in numerals for example). The closest tabular representation would be the weekly stats at the bottom.
I think they make a nice compliment to the other graphs on the page, and do not sacrifice usability for aesthetic appeal given that there are other styles of chart used where appropriate (for example the time series of visits etc.).