I've had my eye on SC:C for awhile now, and now that I finally have some money on iTunes, I've been trying to decide whether or not to get it. Here are a few questions I have: a) Does it have a good length for it's price? b) How easy are the controls to use (mainly the aiming)? c) On some of the Xbox SC games, they can be way too hard sometimes. How hard/easy is this?