The BIOS here is nothing out of the ordinary for a GIGABYTE motherboard. You have all of the features and pages you would expect to find. It is a nice layout once you get used to it. We will go through some of the pages you get in the images below.
The M.I.T (Motherboard Intelligent Tweaker) pages are nicely put together. Each subsection is only one "page" and contains the items that you need for that portion of overclocking.
If you are looking to overclock then here is where you will spend most of your time.
It is a lot of moving around, but the single pages make things easy to find and also make it harder to overlook an important setting.
Of course, you still have the other sections that you need just to get things going, like the Integrated Peripherals page and others.
Overall the G1.Assassin's BIOS is well done, but nothing unusual.