I rarely, rarely ever use walkthroughs or cheats for non-adventure games. I once bought the Prima guide to Tomb Raider: The Last Revelation and used it to finish the last 3/4 of the game, pretty much because I got bored with it and at least wanted to complete it. I used god mode for Return to Castle Wolfie in the final levels because I decided the story sucked, I didn't give a damn about the lifeless hero character, B.J. Blastmyasskovitz or whatever his name was, and though the game looked beautiful I lost any motivation to finish it so I just finished it 'illicitly'
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