Does Firefox render anything wrong? And pretty much all WebKit browsers display websites the same, if they're using the same version, so it's like Chrome/Chromium there.
First, there's maybe only one other browser that uses GTK - unlike pretty much everything else, Midori looks native on my desktop. It's also light (download size, memory), clean, fast, but still with a decent featureset. Private browsing, add an extra frame with its own set of tabs, toolbar customisation. Customise every keyboard shortcut. Built-in ad-blocking, RSS reader, mouse guestures, auto-filling forms, user styles, user scripts, element inspector and development tools.
Little things you don't really see anywhere else, or at least where they're easy to find. Things like copying URLs of all open tabs to the clipboard, switching between tabs like you would programs in most modern desktops with alt-tab (goes by recency instead of position), duplicate tab, hide text from a tab so it's only got an icon, import/export bookmarks, useragent switcher (and with some defaults to choose). Easily assign external applications as text editor, download manager and feed reader. Easily add custom search engines - like with Firefox, only for anything: it doesn't have to have an addon for it already.
And it's only at version 0.2.9.