Fresh and original at every turn
This being a spy game, lots of sneaking and reconnaisance is of course expected. However, besides one mission in which you must remain undetected all the way, it IS a viable option to go in with guns blazing all the time, if that is your preferred style of play. That is probably not the most effective (or even the most fun) method, though. Fortunately, there are many gadgets (as mentioned above) and silent weapons (including a crossbow) that make sneaking around a bit easier.
Graphics are, technically, not spectacular (especially since they are pretty dated by now). Artistically, however, they are delightful and very reminiscent of the style of the '60s. The music and the voice acting are excellent. There are a few vehicles in the game, but they handle pretty awfully: fortunately, they are not really needed. Lastly, something must be said about the humor in the game, which manifests in the sheer outrageousness of some of the people and situations, and also in the hilarious conversations between enemy guards that you overhear while sneaking up on them. This is definitely one of the funniest shooters ever made, if nothing else.
[Note: The Mega Mix Demo for NOLF is pretty disjointed and confusing (plus, they don't tell you some crucial information on how to use your gadgets), although it shows a bit more of the diversity of the locales. The first demo (featuring the whole Misfortune in Morocco mission) is, in my opinion, the more enjoyable of the two. Choose as you will.]
But the bottom line is: No One Lives Forever is a great game, and worth a try!