I jumped in quick just to take a look before attempting it on the weekend, and once I noticed the timer and the usual bullet sponge enemies, I just laughed and shook my head. Timers are a tired and unimaginative way of increasing the difficulty, and shows Bungie lacks imagination in several key areas. I can't appreciate a mission if all I have to do is rush as fast as possible to beat a timer, because if I wanted that kind of limiting and boring play, I'd load up Goldeneye and spend my time looking at the floor all the time doing speed runs...