big show was never that dominant. he was a lot quicker on his feet but he wasn't truly as big or as strong, and just about everyone and their mother has slammed him, suplexed him, AA'd him and F'5'd him. this is why he was never really a big draw.
if you watch andre's WWF matches it was a big deal just for the other guy to get him off his feet, in fact a lot of the time you COULDN'T get him off his feet. punches and clotheslines had minimal effect on him and you couldn't slam him.
the difference between big show and andre is that andre was an actual giant and big show was more or less just a really big guy who called himself a giant.