Every time they pull a stunt like this, this becomes a little bit more clear. If the EU wants to avoid the spread of euroskeptic populist parties, they should be working to patch the system and be building legitimacy and credibility, rather than be seen working to undermine it.
Now, I think there is a problem here; in many countries the public can barely bring themselves to care about the European Parliament elections, nevermind who their government nominates as commissioner. But ultimately it is as much in the public’s hands as a ministerial appointment.
Then there's the commission, which is even less accountable to the voters.
Of course that would be a very, very risk approach...