I've never understood these desires to knock ISPs as generically bad, rather than making specific criticisms of their services. Every company manages the occasional example of bad customer service, and every company manages to keep the majority of their customers happy, otherwise they'd go out of business.
Ultimately, there are a variety of services at a variety of price points using a variety of technologies, with a variety of usage limits, speeds and support packages. It is for the customer to weigh up the advantages and disadvantages of the options available to him or her. If you go for a low cost provider, you accept the limitations inherent in a low cost service, but for many, low cost providers like TalkTalk and Sky are an excellent option.
To give an example, I left what is now Virgin Media's broadband service because of oversubscription problems, but remained a television customer. As that was ten years ago, and even then only related to my immediate area, it says nothing about Virgin generically, other than being an example of the issues that can arise from those technologies (cable modems, satellite and PON based FTTP) that use a shared local medium.
If more capacity is sold on a shared medium than it can support, after making a conservative allowance for contention, the resulting saturation will cause issues with excessive latency and jitter. Clearly, these issues are less likely to cause problems with FTTP (which, in the current BT Openreach implementation, uses a gigabit connection shared between no more than 12 users) than with satellite (where the bandwidth of a single spot beam is shared amongst users across a wide geographic area).



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