Linksys Firewall/router

[Apollo]

Hello,  I was wondering if anyone has had any experience with Linksys
firewall/routers.  I've have Comcast cable internet and have been using this
firewall with great success for some time now.  I got in a debate with a
tech about the reliability of these firewalls.  He didn't believe that these
firewalls were any good because they didn't block enough ports.  I've done
port scans before on these firewalls and nothing is left open that isn't
supposed to be.  Yet he insists that they aren't any good and has little
explanation about why.   Does anyone have any experience with hardware
firewalls?  Are these Linysys devices any good and if not what is a good
alternative?

Thanks,
  David