Not every game can be a classic. But sometimes notorious stinkers can be worth looking at, too.
A good example of this is Leggit by Imagine, originally released on ZX Spectrum as Jumping Jack then ported to Atari with a new name. While not a particularly good game in its own right, it did inspire a number of clones, suggesting it had some influence back in the day — and its basic formula can be rather indirectly traced forward towards some more modern releases that do things a bit better.
It’s also interesting to look at this game in terms of what not to do from a game design perspective… or, if nothing else, to ensure that my suffering through this nonsense wasn’t in vain!