I like the 2nd one. WAAAAY too much going on in the third. Nothing really imposing in the first.

1st one is crap. 3rd one looks like you are fighting robot Nazis- awesome.

3rd one looks pretty cool.

First one - plain and simple but straight to the point.

If I had to put it in order from best to worst itd be the second one as the best, first one in the middle and the third one last

1st, 2nd, the one above, 3rd.

first doesn't look like a fps to me so i'd pick it up to see the back.

second is decent

one above and third just looks bad to me.

I like the first one.

On a Side note:

First reminds me of this.

Second reminds me of this.

The first one. Like someone said earlier, it really sticks out and grabs your attention. The other two look like pretty standard covers, nothing special