bbPress is a forum … ? Right ? … Yes - so it should show the forums as tables that look more like table.
I have created new versions of all of the blank bbPress forum themes to provide a slightly more tabular style. This will give you a starting point that seems more natural.
Other [...]

The theme switcher plugin has now been installed and can be used to preview the blank / raw bbPress themes. Go to the bbprressraw forums to access the theme switcher (look for a drop-down box at the bottom of the page).