I trust that the majority of Softonic users have an antivirus installed and use it regularly. At least, I hope you do, because Windows Malicious Software Removal Tool isn't a replacement for one. It's a complementary tool, or at least one to use only in very specific circumstances.
Windows Malicious Software Removal Tool is a portable application that performs one of three scans - Quick scan, Full Scan, and Customized Scan, which is a Quick scan plus a folder of your choosing. It's probably going to be of most use when checking a friend's computer for viruses or when, for some reason, you need to do a standalone check on your own PC.
Windows Malicious Software Removal Tool has no configuration settings or fancy interface. It's very plain, but has the advantage of being fast and simple to use. You can view a report of the scan results and use information online to get more details on the tool, but in the way of options, Windows Malicious Software Removal Tool doesn't offer anything else.
I'm not sure what kind of user would need Windows Malicious Software Removal Tool, but if you do, it's a simple and rapid virus scanner.