I adore this game. I've beaten it twice, and have replayed several chapters for fun. To me, it's absolutely worth buying.
Full 1000 in:
Ninja Gaiden 2, Vanquish, Lost Planet, Sonic Unleashed, Mass Effect 1-3, Alpha Protocol, Fallout 3, Fallout New Vegas, Elder Scrolls IV: Oblivion, Dragon Age: Origins, Sonic The Hedghog (2006), Sonic Generations, Eternal Sonata, Tomb Raider Legend, Tomb Raider Underworld, Resident Evil 5, Halo Reach, Fight Night Round 3, Sonic's Ultimate Genesis Collection, Modern Warfare 2, Call of Duty 2, Bioshock, Star Wars: TFU, Prince of Persia: TFS, Terminator Salvation, King Kong.