http://www.pcmag.com/article2/0,2817,2353447,00.asp only reason it got a score of "good" is because it's free. This program deals with spyware horribly, I can't count how many times I've had it detect something on somebodies computer and claim it cleaned it out when it didn't do shit. I'd give it a 6.5/10 and that's being generous. My job is 90% removing spyware and viruses from peoples computer. This program does not do a good job. It's MS's answer to Mcaffee, which is possibly the worst "security" program I've ever encountered. Actually I'll give MS's proggy a 9/10 because it leads me to a ton of business which I wouldn't get if the people weren't cheap and bought Malwarebytes & NOD32. Funny thing is big allure of MSE to these people is the price. But when I go to fix their PC it cost them $99-125 for me to get their shit back into working order. It might be the best free AIO solution but I'll still take Avast + the free Malwarebytes for better protection.
Maybe my findings aren't super accurate, but having dealt with 5 PC's this month alone with MCE and still having spyware I can say it's a questionable program in my eyes.