Overall:
The Moon is a hard place to review.
It's definitely not fine dining; let’s get that out of the way first. The food isn't great, the service can be sloppy/slow, and the place is often crowded and stuffy...
But somehow, this is a place people find themselves. It's open very late, has reasonable prices, and is so.... unrefined that being there while drunk (or to GET drunk) seems perfectly OK.
Spiel out of the way, here's some details. The food – This can be hit or miss depending on the time/night, but generally it's decent. The wedges are usually very good, and the pasta dishes are sizable. You won’t be ranting about subtle sophisticated flavours, but you won’t go hungry.
The cocktails are usually good - Smurfs are delicious, but the Pina Colada I had wasn't great.
Service is hard to describe. It's often slow, and since the place is usually so crowded and cramped, that slows things down further - my group of 5 managed to pounce on a table as it was vacated, and after 10-15 minutes the dishes hadn't been cleared and we decided to walk to Hog's Breath. When you do get service it's usually good and cheerful, very casual...
Don't go here if you're claustrophobic. It gets very crowded, cramped, noisy and humid most nights.
They also do dessert pizzas, but I've never tried one.