Best spec opps game. – Commando: Uncharted Duty Review

Maybe because it doesn't get bogged down in detail and crumple under it's own weight. There might be more involved games, but if you're looking to just jump in and start shooting, this is the one to get. A little bit pricey with IAP, and doesn't have the detail of some, but sometimes simplicity works.
Review by The OnionEaters on Commando: Uncharted Duty.