Individually I'd say probably none of the DLC's were worth they money they were charging for them, but they were still fun, added some gameplay, and expanded the story a bit. There have been some really good sales on DAO/Awakening with all the DLC, if the OP got in on one of those then I'd say it was definitely money well spent.
Anyways, the order you play them in isn't all that important. The one that lets you get the playable party member Shale is the only one that really matters when you do it. If you want Shale to be one of your party members, its best to do it as soon as you can so that you can use him in your party. The rest don't matter much except that you get some really powerful gear in them. If you want to use that gear to power through the rest of the game then by all means go for it. If not, you can hold off on it or you can just go through the DLC and ditch the special gear you get from it.
Awakenings should be done last because it extends from the end of the story from Origins. Also, you can use your character from Origins in Awakenings if you want, and some of your story choices will carry over.