Sure, Windows defender is better than not having anything installed. But when it comes to detecting and cleaning infections it just lags behind the rest. Im probably being a little harsh on Defender, It has come a long way and its much better that it was a few years back. But its still not great. Anyone can go and read up on this, Go and check its detection rates, dont take my word for it. The information is out there....
We have a security team, Im not part of them but we work very closely as i'm the IT manager in my region, 90% of the times the infection/threats we get is beacuse of one of these clever savy oaks who things they know whats going on and it will never happen to them....You guys have no idea the amount of Malware exploits that's out there and how easy it is to get infected/hacked/exploited...And thinking you are protected beacuse you have defnder installed...:-/
When you get infected and your machine is blocked by Ransomware(or basicaly any virus you /defender cant fix), Call Microsoft and tell them you have Defender installed and let me know what their response is/was...
Im sure I will get a responses here attcking me again as here are so many subject "experts", unable to have a decent talk or debate...but I honestly dont care. Fact of the matter is you need a good AV. You cant go wrong with Bitdefender. Kaspersky is also good, as is SOPHOS, ESET and Trend.