I don't think that's true. Vista was so hated, that 7 was pretty much universally heralded as a big improvement, even if half of that was the ecosystem getting used to the new driver model introduced by Vista.
And as others have observed, 2000 was an immediate hit with everyone who tried it.
I rang up several years ago to try to get a discount for reasons I can't remember. I ended up being upsold and today I'm spending far more money than I should, but my Internet is so, so fast. And my IP address, whilst not "static", changes about once every three years. Not something you'd run a website on, but very convenient as a developer when being restricted by IP range.
I've heard the customer service is bad, but to be honest, I never need it speak to them. On the whole, a happy customer over the last 18 years (whoever they were when I signed up in 2002- NTL? Cable& Wireless?)
This tool is wonderful - mindbogglingly fast. I can't believe how long it has been around, without equivalent performance or consistency baked into Windows. I think I first used this before Vista came out - has it really been that long?
And as others have observed, 2000 was an immediate hit with everyone who tried it.