text: I haven't tweaked the PS3 in any way no port forwarding ,no router tweaks just connected and away I went.
  The PC on the other hand is performing dismally. When I was with NTL the server list was hitting the high 400's!
  Are you sure you haven't ticked a filter on the search, IE. you are only searching for unsecured ( non punkbuster servers ) of which there are very few?
  As for getting kicked, check your pc for spyware etc, punkbuster will kick ya if your machine has problems in that department also run "memtest86" and check you have no memory problems again this can result in punkbuster kicks. I am assuming that you have the correct patch installed.
  I can only give you a little advice as I stopped gaming a while ago but these are all valid reasons for your current problems, im sure there are a few more im forgetting.