I wouldn't go that far. Windows firewall is a very basic firewall. Also Windows Defender has one of the worst detection rates of any of the free AV programs. Both are adequate, but certainly not great.
You need to read up on security info more.
Read this -
http://www.av-comparatives.org/firewall-reviews/
Scroll down to 'Results Overview' test. Windows firewall is better than -
Outpost, AhnLab V3 Internet Security 8.0, Bitdefender Internet Security 2014, Online Armor 7.0, eScan Internet Security 14.0, ESET Smart Security 7.0, Norton Internet Security 2014, VIPRE Internet Security 2014,
Zone Alarm Free Firewall 12.0.
Key to ratings in the test
++
: Complete protection. The product protects the com
puter completely against all three forms of
access, regardless of whether the computer name, IP
v4 address or IPv6 address is used.
+
: Partial protection. The product protects the comp
uter only in some cases. For example, it may
protect against attempted access when the computer
name is used, but not if an IP address is used.
–
: No protection. The product allows access using co
mputer name, IPv4 address and IPv6 address.
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See this website too- ↓
http://www.digitalcitizen.life/5-reasons-why-windows-firewall-one-best-firewalls
Windows Defender isn't bad as people say, I tested it against other security and it came out better than some paid popular anti-virus security.
Hope this helps
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