Well there is the old truism that you only get people complaining on forums, and very few of us bother to praise when things are good.
My connection is generally stable and has pretty much always been so (apart from a couple of instances that required an engineer to fit attenuators to bring down power levels). I've been with Virgin since the Eurobell/Blueyonder days so I don't really have a lot to complain about.
Crawley, where I live, may be especially lucky though, as up until Telewest bought out Eurobell, we had an analogue cable system. I imagine that a lot of work had to be done to bring us into the digital age, and I'm theorising that we therefore have newer kit than most (that's just idle speculation on my part though).
To my mind, the speed of the upgrades means that every part of the VM infrastructure is having to play catch-up with every other part. Hopefully at some point somebody will say "Hang on, we don't need to give our customers the ability to download the internet every night" and then we will have a stable network (yeah, I'm an optimist
).
The thought of moving to ADSL gives me the shivers to be honest, which tells me all I need to know about how I feel about my cable internet!