I would say that it can be cheap, depending on how you use it, but it's not necessarily ever cheating. Even if you look up what you need to do to progress, you still have to do it in the game, so it would only ever be cheating in something like Professor Layton where figuring it out is the whole point of the gameplay. Even if it's not an entirely puzzle-oriented game, though, I wouldn't say it's very classy to use a walkthrough all the way through a game. If you can't for the life of you figure out what you need to do, then by all means look it up, but for the most part you should try to figure it out yourself. The first time I played through Twilight Princess (I was only 12 at the time), I had a walkthrough that I followed religiously to lead me through the game rather than figuring ANYTHING out for myself, and I regret playing through the game that way. It's been a while since I played it, though, so I should be in some ways going fresh into it when I replay it before starting Skyward Sword, and hopefully playing it the proper way will help redeem myself in my mind. >_<