That would seem a tad unusual... the 3 was pants for wifi.
Get a 6, absolutely stonking wifi from mine.
I must of been just unlucky with my Smart Hub or I have lead walls due to Wi-Fi got half way down my hall way.
And if located in middle of the home it never reached the outer edges of the home, where as the Fritz!Boxe's and Linksys routers Wi-Fi are great.
Other than the Wi-Fi issues I did like the Modem / Router, but it did have loads of issues and bugs in it and not being able to report them apart from the FTTP Team on the phone and BTCare on Twitter, these issues never got fixed.