as I understand it, euro-sceptic means wanting to leave the EU. I'm thinking that if you want someone to vote down unreasonable laws, then you should vote for who seems the most reasonable
When I wrote to the various U.K. MEPs in 2018 regarding the (awful) proposed EU Copyright Directive, the only ones that intended to vote against it were the Euro-skeptics and the Greens.
I was impressed at how the Euro-skeptic MEPs understood my concerns and took the time to write back to me in detail. They seemed by far the most democratically engaged of all the MEPs I communicated with
It turns out that in France the MPs who could do that are from the far right and that is why I asked the question above.