VF, customer service and forum threads
I've been with all of the networks (other than 3) over the past twelve years or so, and came to Vodafone last. No broad complaints from me in terms of customer service - at times it's "ok", other times world-beating. But that is certainly better than o2 and T-Mobile, and about on a par with Orange about seven years back.
And what is certainly clear is that the VF network is more reliable and robust than others I've used - and other than the odd blackspot 3G services are considerably better.
As for forum threads being closed - when there are usually existing threads open, morons opening another thread asking the same thing as before (all it takes is a search to see what is there already) deserve all they get.
(And yes, I've worked in mobile telecoms. For the past nine years, although not at present)