The European Commission's members are sent there by the national governments. Elect another parliament/government if you don't like who yours did sent.
It's easier to vote "yes" in an quit the EU referendum than what you suggest. Which is what the Brits actually did. The former works while the latter doesn't.
We don't elect governments over here, just Parliament and President.
That’s like saying if you don’t like a police officer then elect a different city council. Parliament members don’t campaign on who they’ll nominate to the EU commission. Brexit can’t come fast enough.
Proposed yes. Just like in the UK un-elected civil servants propose all kinds of laws and regulation. Just like with the EU commission you only get to propose laws. The council of ministers (heads of states for EU countries) and the directly elected EU parliament actually get to enact regulation.
Being able tho propose a law is not ther same as enacting a law, and is not the same as applying a law which is what the parent comment said.