Army of Two. For under $20, good for someone who only intends to play 1P?

[dougsdad0629]

I love any kind of game where I get to shoot people.  I've avoided Army of Two because I game alone 99% of the time aside from the occasional online match or two.  Now that Army of Two can be had for under $20, is it worth getting for someone who will probably only ever play it 1 player?  All the videos I've seen look pretty fun.