Shockingly poor judgement when appointing to high office (Peter Mandelson, Louise Haigh, Tulip Saddiq, Angela Rayner, for example).
Constant U-turns due to ill thought out policies.
Failure to deliver the manifesto that got them elected.
Other things that add to their unfitness to govern (and go against all the pious promises and hair-shirtery we got from Starmer in opposition), such as:
Starmer misleading parliament about Peter Mandelson's appointment and then whipping his MPs to avoid facing an inquiry into his conduct.
Sleazy MPs - like the one that hoped a constituent would die before the GE, because she wasn't going to vote for him, that drunk bloke who beat up a constituent in Frodsham, all the government ministers - including the prime minister - who snuffled greedily in Lord Ali's trough.
Rachel Reeves and that bloke who pretended to be a solicitor, lying on their CVs.
I'm sure their are many other examples, but I'm feeling depressed just thinking about them.