I wouldn’t necessarily say they were bad, who wouldn’t say put more money in to Public Services if there was no cost of doing so.
What they did however, was make reckless promises just before the Election, say for example, promising to backdate the State Pension for women to 60.
Never mind the cost of doing it, but there is the ever so small problem of the Equality Act introduced under Labour.
If you do it for women, you have to do it for men, because the fundamental principle of that Act is we are all treated the same.
No way could the Country afford that and Corbin and his sidekick lost all credibility as to a Party who could run the Country without quickly bankrupting it.