I ran in 2023.
The good. The corrals go off roughly 30 seconds to a minute apart, which is great because you actually have space to run in the first miles. The course is beautiful, especially through the park.
Plenty of aid stations-they use Nuun with water and/or just water. Crowd support in Philadelphia proper was lovely, and you're buoyed by other runners on the out and back portion through the park.
The bad. No clocks around the course. Only some mile markers. When your GPS is going off around the city, that can be frustrating.
The expo was efficient to navigate, and Reading Terminal is a great spot to get food at afterward.
Prices were also reasonable.

I ran in 2021 with a colleague and we had a generally good time.

The Pros: The course is very flat-the tunnel and a couple early hills (mainly overpasses, in all honesty) but otherwise very flat.
Aid Stations were plentiful, and people were energetic.
The run along the water was super pretty and running through the Boardwalk imagining the crowds during the summer is cool.
Shirt and Medal were of good quality.
Bathrooms galore pre-race. They use Atlantic City Casinos.
Expo is on the beach-grabbed my stuff than spent time in the ocean, nice day.

Cons:
People in the area don't know about the marathon. I was swerving around people on the Boardwalk, which was slightly irritating in all honesty, all people who were just walking dogs or strollers, and I was in the faster group (3:17)
Hotels. Its Atlantic City. Cigarette Smoke for days...little annoying, especially for a guy with asthma like me. I stayed outside the city, but it wasn't exactly ideal.
Straightaways-good-except pothole laden.

I like the race because you can travel day of from Maryland, PA, NY, and Jersey, which works out well.

I will likely do again, especially because it is a small-ish race.

For starters, it is a later start (10 AM) than your typical half marathon. I liked how they had walkers start early, than slower runners, before the main pack last.
All the money goes to helping families affected by cancer. Despite that, a 60 dollar fee was all it took to get in. The shirt and medal were simple but nice.
In terms of convenience, the course is literally right off New York 17 East, which connects up with I-87 very easily. Parking was around the course, and there was plenty near the expo. Having same-day pickup was a plus.
The course has more hills than your typical race, and the hill around mile 8 is enough to really test your mettle.
Communication was fantastic-the race director's emails are different from the corporate version of so many races, which is refreshing.
I don't like doing the same race twice, but I may be back for this course.

I ran MCM 2019. It was rainy and windy-ideally the conditions every runner dislikes, but the crowd made up for the horrendous weather.
Pros:
You're running Washington, DC. The sights are incredible!
The crowd is incredible, and when I got hurt during the race, they were what kept me from not doing a DNF. There's so much energy and it is infectious.
The shirt this year was tremendous-which made sense given that 2018's was a disaster, and the medal was good, too.
Motivation is not lacking. When you're limping along and see a double-amputee motoring along, needless to say you're not going to quit.
It is one of the largest races in America, I'm not surprised that people find it hard to enter via the lottery.
Cons:
The expo is nice, but nothing extraordinary, which kind of surprised me given the size of the race.
It is a little bit of a walk to the finish festival, but the festival is nice and the experience there is great.

I would absolutely do this race again, if not for the fact that the conditions this year were brutal and I would love another shot at the course. I ran a 3:50, but it was almost 30 minutes below my typical time.

I was looking for an early fall race not too far from New York City.
Pros:
The course is not far off-not even 10 miles-from I 78 in Pennsylvania.
The medal is simple, but solid. Shirt was nice, but nothing to write home about.
Cost was also very reasonable-I paid $90 roughly three months before the race.
There were plenty of porta-potties before the race, and the start was very easy to get to. I parked in a deck near the finish line, and it paid dividends after the race.
Cons:
The organizers modified the course this year, and it is a little hillier than advertised, especially early in the race. I'm someone who tries to visualize the course when running, and it definitely through me for a loop, but the overall flatness of the course makes up for it later on.
It is a trail race, so if crowd support is big for you, this isn't the race to do.

I would do the race again. It is not spectacular, but for price and location, it is a good deal. I used it as a training run for the Marine Corps Marathon in DC, and I wasn't the only one doing something similar.