I don't know what the NTL run part of the network was like before Virgin took over but the Blueyonder/Telewest part was very well run. I was with them for several years before VM took over and they were forever upgrading the network. Also, their technical support was usually pretty good, (if you allowed for the fact you were guarenteed to have to wait at least 20mins to talk to someone), as in they knew pretty much what they were talking about and were willing to pass things to the real engineers if you asked for it. These days all you get is fobbed off by some numpty that clearly is just reading from a process document and has no clue about anything other than ticking boxes. Plus the point blank refuse to accept the issue is with their network unless the 1 test they carry out shows a problem !!
As for the FUP, well BY/Telewest had one but they certaintly didn't have a traffic shaping policy. That was a new change by VM. Although I have to say I've yet to fall foul of it.
BTW - in case anyone is interested BT have finished initial trials and are looking to expand the trial of FTTC, which in combination with VDSL2 for the last leg will enable them, (and therefore any current ADSL provider) to offer products at significantly faster speeds, than currently available to non cable customers.