alien hominid - it's a lot more quirky and it excels at parties with its brilliant four player pda games, as well as allowing continues throughout the main game. (the difficulty is a lot higher in AH than MS3, but it is a lot more forgiving as well.)
metal slug 3 for xbox does not allow you to continue mid stage, so be prepared to be very frustrated in stage 5 when it lasts for maybe 45 minutes or so and you can't continue without restarting at the beginning of the stage.