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Aside from shoot-em-ups, there aren't many types of games from the "insert coin to continue" era of arcade gaming that I like very much. Reason being, the games are usually designed around "getting to the end" rather than interesting scoring systems. In the process, they fleece the player of as much money as possible -- often going through phases (boss battles, etc.) where credits last about 5 seconds.
So, run and gun games like Metal Slug aren't normally my bag, but I have to admit, this game is pretty awesome. The detail in the graphics and animations is outstanding and you can tell they really took a lot of care in designing this game.