Catcher isn't a real problem at the moment. Weiters is making $10.5 million, so he's staying and starting a majority of games, unless he's injured. They need to figure out if Severino is the real deal or not, and since the Nats have never developed a catcher from the draft/foreign signing stage who might be a starter (Flores was a Rule 5 pickup and Ramos came in a trade), they need him to play as much as possible.
The starting rotation is solid 1-5, and they're waiting on injured guys to come back on defense and at the plate. The hole is the bullpen, much as it was for a lot of last season.
If you're wondering how badly Matt Albers has fallen off, here are his current stats:
2-1, 1.20 ERA, 13 appearances, 15 innings pitched. WHIP is 1.067, he has 12 strikeouts and has issued 3 walks. He's given up 1 homer.