The plan was very ambitious and required the Germans to drop the ball. It doesn't seem like 100 % mission success was realistic or possible. Murphy's Law definitely came into play. Too much could've gone wrong and did go wrong. Communications are important, but if your reinforcements don't show up, the radio doesn't change your situation, you're still SOL.
shareI think Mark Felton had a good series on youtube (it may still be up there) about the aftermath of Market Garden. The operation being only 90% successful meant a horrible winter of starvation for the half of Holland that remained occupied and robbed the allies of a potentially faster end to the war by a few months if they'd succeeded in holding the Arnhem bridge (though it wasn't the very last one before the Ruhr - Germans still had the IJssel to fall back to).
However from a tactical perspective they did manage to tie down quite a few German troops in the area and destroyed quite a few divisions in the fighting. The Germans launched several fruitless attacks to retake Nijmegen and all failed at high cost. This included a lot of crack SS divisions with the latest gear which could otherwise have helped slow down or stop the Soviets in Poland. The end of the war was inevitable at this point, but I'd wager that had it been 100% successful, the Americans may have found themselves sieging Berlin and the post-war would not have an east-west division of Germany.
The Americans learned, never let Montgomery plan a military operation. He was useless.
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