Contra 4 review at IGN.

"The Contra series, like any great and popular videogame franchise, has been spun-out into sequels almost at a bi-yearly rate since the creation in the arcade two decades ago. Contra games have been produced on systems across the whole spectrum, from the NES classics to the Genesis and Super NES, eventually moving into 3D on the PlayStation and Saturn, and ultimately capping off (currently, anyway) on the PlayStation 2 in Contra: Shattered Soldier and NeoContra. Each sequel had its ups, downs, pros, and cons, but ask the hardcore fanatics which one's their favorite and chances are they'll harken back to the old-school trilogy: Contra, Super C, or Contra III."

Full Source: IGN