Laughable means that the somthing was "bad" so bad that its funny. Now if the film was a comdy, and it was laughable, was the film good or bad? After all it achieved its purpose didn't it...
I thought, it was one of those corny jokes.
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laughable says you laugh at, you wouldn't say its laughable if you would laugh at it, you would say was funny or sumthing along those lines