Alot of people complain about how they didnt get enough for their money with the dlc. But if you bought the dlcs when they first came out you could of got into plenty of games with defiant or noble maps. Like if you bought the defiant maps pretty early you could of enjoyed them the whole summer with the 1000 other people in the playlist.
But I think what went wrong is that people that buy the dlc now barely even get to play the maps and if you do you have to play squad dlc with only about 200 people. Also the achievements are really hard to get if those maps never show up.
I liked how in halo 3 though bungie made it so that after a while you have to have the map packs to play most of the playlists. They made it so that the heroic map pack was free and cold storage so that everyone could download it and everyone could play those maps.
What I have learned from reach dlc is play the dlc as much as u can when it first comes out. So enjoy the anniversary maps before there isnt alot of people!