I suppose they are broadly reliable. I know they have been weighted towards Labour, but what about so called "shy tories"? How many times do people complain that they've never been invited to take part in a poll? They'd probably hang up anyway. I'm prepared to give them another chance...
In 2015 polls suggested a hung parliament but we got a Conservative majority. Psephologists wrongly predicted the results of the US presidential election and the EU referendum and in 2017 they forecast a Conservative majority but we got a hung parliament. So can we trust polls any more or not?