7. Leviathan
Despite some negative feedback surrounding Mass Effect 3's first story expansion, I quite enjoyed him. It was tense, action packed and mysterious, maybe even a bit creepy at times. It felt different to the rest of the main game, which is quite a feat considering it adds no new enemies or gameplay mechanics. The story was creepy as, and I constantly wondered what the hell was going on. It was the most intense example of story telling yet seen from the franchise. The level of tension and the feeling of needing to rush really pulled you through the new levels, and the whole pace is really great. I have high hopes for the Omega DLC, I've been wanting my fix for Aria for a while.