FWIW, the Only Decent Lounge I ever used with the DC card was the NWA one at EWR, but unless you are flying on a Carrier that uses the B Concourse in Term B no way to get in.

All the others Ive used thru the yrs werent much better then being in the reg areas, except with free non-booze drinks.

Lima wasnt bad but its no longer in the program.

Id probably skip getting a DC card simply for Lounge Access, and instead try my hand at getting a member of a Club to bring me in as a guest. Its worked for me the 3 times I had misconnects the past 2 weeks in regards to CO Clubs.