Frank W.
Yelp
I was impressed by the Delta lounge, favorably so (you can be impressed negatively as well). I have admired the renovation of LGA in general, though the basic layout cannot be made more efficient than the physical configuration permits, and they seem to have done the best they can. I fly JFK much more, as many as 100 flights in a year, in or out. I use LGA only maybe a half dozen times during that same time period, and I rarely am on Delta. I'd say the Delta lounge at LGA, if you want the most direct comparison, is superior to its counterpart at JFK. I've been reading about how important this perq has become, in terms of consumers choosing a credit card or airline, and as much as I am a frequent flyer I also am a regular patron of these spaces.
Here is the best test. My flight was short, LGA-DCA, and at 7:25pm. I thus had time to eat. But it was not convenient before I departed for the airport or after I landed at the other end. I was wondering if I could make a full meal out of what was available at the buffet. I can report: yes, and I do not mean just crackers and cheese. The food was not the same quality as at the Centurion Lounge, but it was not too far off the mark. I could see someone with this information routing themselves through LGA for the purpose of enjoying supper. I had chicken salad (the Waldorf preparation, which I think refers to the hotel in Manhattan) and shrimp salad for the proteins, and I had no GI issues. They had a chicken marsala, and I had mushrooms from that; other than in salad, I'm not into chicken.
The space was vast. I am not sure of the square footage, which was broken up into various sections, but it must be more than at JFK or elsewhere. They had, for example, two separate sets of restrooms. There was no problem with crowding. The service was brisk. Everyone was suitably friendly.
I had two stays. The reason is my flight had an issue. Or, rather, my seat did. My flight was fine. My seat was cancelled, despite my having a valid boarding pass, and they put me on the last flight out and gave me miles in my account.
If you can enter, there is no reason not to do so. This rates as among the best airline lounges in the domestic line up.