Hello everyone!
Sure Marquez is a pumped up super featherweight. He gained few pounds (rather fat than muscles), he's probably not at his peak at the age of 35 and few wars in the ring behind him but we should give Mayweather his credit. Marquez still is one of the best guys in the business, he's a fabulous fighter, great warrior and he was just helpless.
Mayweather was the bigger guy in the ring, he had height and reach advantage but I believe that it was speed and skills that made the difference. Floyd was much faster, he's defense was so good that he seemed just untouchable whereas Marquez couldn't do anything about Floyd's hand speed and punches coming from different angels.
Marquez wasn't the biggest challange Mayweather could pick but I regard that fight as a tune up before fighting guys that could be a really threat to Mayweather's unblemished record.