Hi, i would suggest if you have the $ to spend then yes!!! IMO they are good maps and can be fun depending on the game types you like! Also there are achievements to be had, and if you like those, go for it =)
On the the other side of things, the DLC has its own playlist and a limited number of players compared to normal MM, so if you dont play so much you might find playing against more experienced players in a small playlist not so much fun!
In my opinion, no. Steer clear of the DLC. The maps are decent on the first DLC, but the second DLC is terrible. Maybe you should get them if they go to half price, but otherwise they aren't worth the money of neccessary to continue playing multiplayer as
much as you do. Avoid.
take it from a man that doesnt have the DLC yes, its worth it, I do have plans in the not so distant future to buy them, been wanting to buy them since the day they came out, havent had the time to get a MS points card and I dont plan on using a credit card
but I will buy them soon
if you're a reach fan you should buy them regardless of what other people say ;)