Up your arsenal shouldn't give you control issues at all. It controls the same as the PS3 ones because they added all those lock strafe modes and whatnot in it. Going Commando and the ones before though do control differently and perhaps somewhat worse. You get used to them after a while though.
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http://www.gamerhandles.com/metro/sig/HAK%20Devil.jpg
http://i51.tinypic.com/2zpi5w4.png <-- How I look as per Clogged_Artery (Thanks!)