I prefer to have a scope larger than one target class when I choose mine. And, FYI, I am an Engineer, and Spies rarely touch me. After a while in the profession, you learn how to spot them and never open your back up. Rather than choosing one class to oppose another, I stick to my select favourite play-styles and learn to counter as many opposing classes as possible. I find class choice more heavily affects your impact in match situations rather than which enemies you can and can't take on.
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