I present my favorite casual game, World War 1 Medic, as proof that even Trench Warfare can be tremendously entertaining.
See gameplay footage here
. Commentary isn't great but at least he explains the gameplay and the sound effects are showcased.
Can download it from the developer here http://www.bay12games.com/ww1medic
Love that game. Feel like a badass every time I save some poor sucker for bonus points.