We had similar experiences on both the 12th and the 13th. MM at DL on the 12th went great. Started out with a bang as we were chosen to be the Opening Family!! We were able to ride Peter Pan and Alice first thing with no wait. My kids and husband then went to try for Matterhorn, but found the line was too long already. I rode Alice again while they did this, had maybe a 5 minute wait. Then we all rode Snow White, Toad, and Pinocchio together. We didn't ride Dumbo or the teacups because my kids weren't interested, but they both looked easy to get on when we passed by.
The 13th EE at DCA was a complete bust. We wanted to do TSMM first and were one of the first in line. It wasn't going when we arrived, but I asked and was told they were just doing final checks, so we were expecting a very short wait. The CM instructed us to form a line a few feet away.
After about 10 minutes, I noticed others approaching this same CM and then leaving rather than joining the line. I waited a couple minutes more, then asked her again what was going on. This time she said they found a problem during final checks and it could be a while before the ride was up! I was REALLY angry ... not because the ride was down, but because they didn't bother to tell those of us who had been waiting in this line during our precious EE time that anything was wrong. Evidently we were just supposed to guess. By that time 15 minutes of EE was gone, TSMM was down, and I knew there would be no way we could get on RSR without a big wait. We decided to head over to DL -- by the time we got there, the lines at the gate were pretty long, even though it was 30 minutes before opening.
TSMM was also down on our DCA EE two days earlier, but at least that day we were told as we were entering Paradise Pier rather than being left to wait in line in the dark.