It's understandable. The Asari and Drell Infiltrators can be somewhat hard to master (low fitness, obscure-ish damage output for the beginner). But I don't get how you can fail with the Ghost. The class is perfect in every way.
Congrats, though. The Slayer's great for killing infantry, but I find it hard to take out bosses with him. How did you build/play your Slayer?
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The slayer is great for piling up points if you spawn rush. I don't really understand why people underestimate a no cool down, fast animation ability that deals 1080/1890 damage over a 7.2m radius with a good stun. You take a while to kill bosses but you massacre everything else. I don't find a vanguard outscoring infiltrators even remotely surprising given the right circumstances.