Well, for the last eight years or so, most of the Republicans in the Congress haven’t really had to work that much. They’ve gotten by with reflexive opposition to everything Obama and the Democrats wanted to do, screaming about Obamacare and holding pointless repeal votes, and generally playing to the worst instincts of their base.
Now that they’re in charge, they’re finding it very hard to make policy, wrangle for votes and so on. For a lot of the House members, this is the first time they have to do their job and actually legislate!