Not only are they underestimating but I saw people on the steam forum openly defending capcom. Admittedly they're a bit mental over there, but it's another example of why I see fanbois and religious zealots behaving so similarly. This situation really riled up the fruitcakes.
edit: I forgot to mention that the issue runs a bit deeper than the mistakes that Capcom could continue to make. Personally I don't think that this malware was a mistake. From a certain twisted logical perspective it makes a lot of sense. The malware allowed Capcom to do exactly what they set out to do and it was the easiest way to accomplish it. Quick and dirty seems to be their motto and I feel that this is reflected in SFV as a whole. So, in my opinion it's an issue with company culture, and that suggests to me that they're more than willing to do quick, stupid things in the future if it benefits them.
My concern isn't that they'll make future mistakes, but rather what will they do in the future if they feel that they can get away with it?
If you want to run the game in a sandbox then Shade Sandbox does this just fine: http://www.shadesandbox.com/
Shade comes pre-configured for a few other apps. If you don't want those apps to run sandboxed then just right-click on the apps and choose the option to remove the app. If you left-click on the app to select then that actually launches the app, so it also acts as a kind of launcher (but you don't have to launch apps from the sandbox to protect them). You can click and drag the game's EXE into the sandbox.
You could also try SandboxIE but I have no idea if that works with the game and that's not freeware. Shade is free.