I was just in DCA earlier this week. The mess and sardine-like condition of the SC there make LA's T2 SC actually look good, although I say that in very relative terms. I agree that LA could use better facilities, and that is hopefully on the way.
Overall, the current state of both SCs makes DL's LAX-DCA offering underwhelming. One would expect that the Delta One service provided on this very competitive route would be complemented by excellent amenities on both ends, but that is not the case today.