Or perhaps: It was the least but I had expected a lot. It proved to be the least from my expectations. Please let me know.
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deadratA - How was the party last night?B - I wanted to go in the worst way, and it was.(That last plays on the expression "want in the worst way" meaning crave intensely, and applies "worst way" to the party instead.)This native speaker of BrE would have no idea what was meant there.
Mr. TomA - How was the party last night?B - It was the least I had expected of.I don't know how it could be said using 'least' or some sort of comparison of extremes, which is what you seem to want to do. My suggestions amount to this kind of thing: