It's all in the thread title, really. If four player co-op Metal Slug-style gameplay with weapon modding and crafting doesn't interest you, I don't know how to help you. If you're one of those ...
I am nothing short of impressed with myself! In the span of one year (from the time I'm writing this review), I have gone from having mastered none of the "Metal Slug" games, to having mastered five ...