Attempted on your own, Army of Two is average a best. The clumsy implementation of the ideas will have you grinding your teeth. Get a human partner, however, and things do pick up a little. It's fun enough and you'll soon find yourselves working together to out-flank and outwit your opponents.
The game is short and sweet but with little to offer any replay value. It's a mishmash of good ideas that have been thrown together with only some success. It bodes well for a sequel, though, as there is life in this original IP yet, but for now it's only really to be considered if you have a regular playing partner.