Can't complain
I can't complain about TalkTalk and I've been with them since they were Tiscali. Yeah there's been an issue with the router, twice, but I still pay less than £18 a month for broadband and phone and that's all good with me.
As for their crummy broadband I work from home and only once had an issue with it which was last year and then it only lasted for about half an hour. No issues with streaming stuff either and they don't seem to block sites that others do. The only real complaint I could honestly make is that their email hasn't always been the most reliable, and in the past has been really frustrating.
Whenever I check reviews for various providers when my contract is ending there's always happy and unhappy customers. When all is weighed up I'm happy to stay with a reliable service (for me at least) if the price is right and it always is when you phone them and say you're not renewing.