Most games can have some value, depending on the audience.
Games have been used as tools for as long as games have existed. Some games teach language, others teach color recognition, while some just teach the patience of taking turns and not touching the bits belonging to others. Snakes and Ladders is a game, but was also a Metaphor; the same was originally true about The Landlord's Game (Monopoly).
I can't remember if the TOS prevent me from linking to outside websites or not, but this one is particularly relevant so I'll risk it. We discussed the dozen BGGs lowest rated games back in 2008 in the On Board Games podcast. In that episode we tried to dissect what value the games had and in some cases what the target audience was. http://onboardgames.libsyn.com/obg_019_the_dirty_dozen
What is your favorite classic game? I like Stratego, Mastermind, Black Box, and even have a copy of Risk Legacy on my shelves at home. If I never have to play Monopoly again, it'll be too soon.