If the offense didn't seem to match the brightness of the season that's because the offense isn't all that bright. It's managed to hang on because of some fast starts and timely hits but it's still 13th in the league in runs. It's the starting pitching that's carrying this team.
Jake Irvin
The Good
His walk rate has dropped precipitously from over 4 per 9 IP to almost 1.5. That's better than he ever did in the minors. He's also seen his HR rate drop to a little under 1, more in line with his minor league stats than the 1.5 he put up last season.
The Bad
He still doesn't strike out many (this will be a re-occurring theme) and guys are basically hitting the ball in the same manner as last year - just slightly less hard and slightly more on the ground. That puts him at the mercy of where the ball goes. IOW - luck.
Overall
Don't put guys on base. Don't give up homers. Strike guys out. Give me 2 of 3 and you will be successful unless you are REALLY bad at the other. Irvin is getting lucky but only a little bit and has deserved this good start. You have to wonder if he can keep up the super low walk rate but until he doesn't why not? You don't know if he has focused on it before
Mitchell Parker
The Good
See Jake Irvin. You have a super low walk rate and a decent HR rate. The HR rate is especially nice because that is what he excelled at in the minors and it's something you could think he could keep up. He's inducing far more GBs
The Bad
He is not striking guys out and he's not inducing a lot of soft contact.
Overall
If you want to be wary about one of the starters Mitchell would be it. He's not just improving at one specific aspect like Irvin. He's never pitched like this before in the minors. Now, it's not like he's doing anything that screams it can't keep it up but he has the least amount of history suggesting he can and if pitching was a simple as "throw it in the zone and keep them from homering" we'd have a lot more great pitchers.
MacKenzie Gore
The Good
Completely coming into his own. The K-rate is ace level as is the HR rate. The walk rate is completely acceptable. The hard hit rate has dropped. Velocity is up. Swinging strikes is up. Outside the zone swing rate keeping going up while the contact keeps going down. Just a grab bag of goodies here. There seems to be actually BAD luck for him a BABIP going which suggests possibly more improvement although oddly he does seem to be a guy that when guys can put in the ball in play they do it pretty well.
The Bad
He doesn't start off with strikes as often as he should and given the mere acceptable walk-rate and high K-rate he tends to throw a lot of pitches quickly. Even with 0 walks last game he was getting to 100 pitches before getting out of the 6th. For someone with a history of injury this can be a precarious thing to deal with.
Overall
I'm not sure what more can you want. He's one step away - either efficiency or durability - from being an true ace if he keeps pitching like this.
Trevor Williams
The Good
2023 was a "bottom out" year for Williams featuring an unusually low K rate and high BB rate. Those have both shifted more back to historical norms for him. Also similarly he's inducing GBs at a rate more in line with what you'd expect from him. He's very much keeping the ball in the park and keeping the ball from being hit well.
The Bad
He's still getting hit hard. Nothing about his strike or chase numbers suggest massive improvement fooling hitters.
Overall
If you want my take Williams is having the make-up year from last season. He pitched poorly and everything broke as bad as it could while doing so. Now he's pitching better and everything is breaking as good as it can. The stats all scream he can't keep this up. That HR/FB rate (3.3%) which is about 1/3 of what the best pitchers normally get for a year is just a flashing red light. Some regression is coming here. The question is if that puts him as still very good or just ok. Again he's pitching well so there isn't a comeuppance to bad coming here unless something changes - which it might - his historic HR/FB rate can get kind of high.
General Memorial Day sense
The Nats are getting nearly everything they could be getting from these 4. There are some things to keep watching and some things not to expect to keep up. I'd be pretty surprised if Parker and Williams are holding the same stats come the All-Star break. But unless they completely collapse, an unlikely scenario, the Nats can still rely on them for decent innings if not great ones. In the meantime Jake Irvin is starting to solidify himself as a mid-rotation starter and Gore is setting himself up for ace status. This is pretty much the best case scenario for the Nats going into the season in a general sense. (I'd say pretty much bc best would include Gray rounding into a #2 type as well). There's likely some comeuppance coming and since the offense doesn't hold the same "likely to get better" status a slight dip in performance but if you are looking toward the future a drop off in 2024 win rate shouldn't bother you more than these performances on the mound by Gore, Irvin, and maybe Parker excite you