I greatly enjoyed playing through the Legendary campaign, but eventually I hit a wall that I just couldn't seem to overcome. I loved the smart, aggressive AI, that cooperated with each other in clever ways, it was refreshing to play a hard mode in which the enemies didn't just have higher stats, but also had smarter tactics. But as I said I eventually hit a wall, and when that happened I switched to the normal mode campaign and, frankly, the enemies in normal mode aren't just weaker, they're kind of brain dead. They're the kind of baddies that you have to step on their shoe to get them to notice you, and that's just not nearly as much fun as the clever and cunning AI I was facing off against in the legendary campaign. In Lightfall, time and development resources permitting, I would greatly enjoy an additional campaign difficulty level, something in between hard mode and story mode. If you just brought over the proactive AI from the legendary mode, with story mode weapon and stat scaling, I think it could make for a fun experience. Currently the story mode is not a very fun experience, it is, if you're familiar with the term, kind of a face roll; that's fine for inexperienced players, or players who want to get through the campaign as quickly as possible, but I still think there's room for a middle ground. The AI design philosophy of the legendary campaign, ported into story mode, would make for a fun and interesting third difficulty level.