I adore the NES, but I would not recommend more than a dozen or so games to anyone that didn't grow up with it. Even obscure shit I enjoyed as a kid, like Fun House, has an absurd amount of repetition and a crazy steep difficulty curve near the end, all for no finale, and an ending of just three screens.
Here are the three screens:
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Other than the star field effect on the first one, they are static images. I've burned out by about 25 levels every time I've tried to run through it. So I messed around with a hex editor to jump around to different levels, and it turned out there's 70-some of them. I pity whomever has to play Fun House all the way through. That is not fun. It's not even a house.