Is buying Left for dead 2 or 1 is worth it for a single player gamer?

I was just wandering if buying Left for Dead 1 or 2 is worth it for a single player gamer? i have a chance of buying a game tomorrow as a friend, i was thinking of buying Left for Dead, but i don't want to be disappointing as Quake 3 long time ago if you guys get what i mean. I don't have a net connection, just a little 3G limited connection to do my limited web stuff, can't play games on it.
 
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