Yes! Yes!! YESSSS!!!
Many testers basically throw in a bunch of malware at the computer and declare it a fail after 0.5 seconds. Everybody at MT, thankfully, doesn't do this. Where are you going to get malware? Does it magically appear, casted my the Malware fairy? Yeah, it comes from the internet, whether it's a popup, email, or drive by, the web or USB is the only way malware can get in!
No need for high detection, I would buy a product with quality USB protection and website blocking, plus good real time, even with bad detection.
Oh, and by the way,
@Manzai, can you please add malware coming from a USB to your tests?