MSE didn’t get a great write-up.
You need to be careful with reviews.
The thing with MSE is, it’s an anti-virus product, and nothing else. This is it’s biggest strength and its biggest weakness. It’s a fantastic AV product, but will always do poorly in “internet security” tests because of all the things it doesn’t do.
The other thing to bear in mind is, many AV products are aggressive to the max by default in order to score well in tests. So, pulling random figures out of the air, MSE might stop 95% of test viruses where Norton stops 98%, but Norton could be constantly kicking the crap out of your PC in the process to achieve that.