More like it doesn't detect anything at all, it's loving crapware and you know it.
I ran a malwarebytes scan on my mums computer that had norton
10 Reg keys
5 .exe's
and a whole crapload of adware
Norton didn't do stuff.
Reg keys and .exes mean physically nothing. A .exe does not imply a virus while a reg key does not physically imply anything except modified Windows registry which can actually most of the time end up as false negatives by simply changing settings. Malwarebytes has default exceptions for registry keys because you might have turned them off intentionally by the way.
Adware's fine though then, since it's the only thing that you said that is a virus.
But hearing Zombie's story as well which actually detected a keylogger which is a pretty big deal I guess it's pretty bad. But did you also scan with Norton though?
I'm considering buying Malwarebytes Premium for Real-Time protection. But I'll stick with MSE for now.