Originally I posted this in the main CO forums but I'm not sure how much cross over there is so I'm reposting it here.
Last night, I completed the Serpent Lantern with Agent Sawyer my level 14, then 15 munitions character. It took me roughly 3 days as I rarely play more than 20-30 minutes at a time and I died ... a lot. Now the later part of this I'm alright with since I did the entire story solo, we'll come back to that first part.
The story was solid, although I would have liked to have seen more gravitas in the beginning especially considering the video using in game graphics that just went up. No pun laden mission descriptions, you actually wanted to read the storyline which is a major change for the game. I'm hoping this is also true with Vibora Bay but have only just started that arc with a different character.
Game play wise I would have liked to have seen a greater diversity of missions. Possibly some research missions or reconnaissance as it is there should be something to break up those three base raid missions. Although in themselves I did enjoy them. The climax was good, along with you mid-boss fight getting there felt a bit stale though.
One thing I did like was the difficulty level. I found myself really having to step up my game as I played through each mission. Although the base missions felt a bit repetitive with nothing to break them up the progressively tougher bosses in each one were a nice highlight. Because of this the final boss actually felt a bit disappointing. It would be nice to have seen more than two attacks and really get the geography as with the mid-level boss. Viperia was really a highlight of the Serpent Lantern and the fight with her, even dying a dozen times was fun and challenging. I really didn't mind dying so much as I was working though this solo.
Overall, Serpent Lantern feels short to me, if possible I'd like to see it expanded on.