Destiny isn’t just Borderlands expanded to its natural MMORPG-esque conclusion. No, Destiny actually has enemies with enough brains to dodge and challenge me. It felt like I was playing a larger sequel to Halo: Reach (without the Halo trappings).
Even on “Brave” difficulty, it was immediately apparent that Destiny’s enemies weren’t distant cousins of those found in Borderlands. The smarter ones hide away from sniper fire and will rush me down if they believe they had the advantage. I didn’t notice much diving from grenades like in Reach though. I suspect higher difficulties will reveal more advanced A.I routines.