In short, yes, to a degree. Much of the work it does seldom appears in the news, so legislators get no credit.
So, thanks are owed to Michelle Cottle of the Atlantic for her story on oversight, "What Congress Is Actually Good At."
"There is one part of the job, however, that Congress consistently performs with great gusto: government oversight—a.k.a., vivisecting the executive branch. Forget negotiating budgets or confirming judicial nominees. These days, lawmakers excel at issuing subpoenas, grilling witnesses, and otherwise probing the administration with a thoroughness that borders on the proctological."