Doing a 180-degree turn to check behind me during the Crucible takes about one full second to do, with the controller analog. In that time, I usually die.
I wish there was one button assigned to perform an 'about-face' spin to rectify this. I wish this were a common practice in all controller-based FPS games, but Bungie is a leader here. The only game in which I've found this feature is Left 4 Dead 2, on the PC with an Xbox 360 controller.
Note: I've just tried turning up my look sensitivity to 10 (the maximum), so I'll see if this improves my issue in the Crucible at all.
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Adding this suggestion to my post, please keep it updated as I will be editing and compiling a community contributed list for developers of Bungie to read :)