Only the crowds and wait to get in makes it less than perfect....
Sam's has been around for many years (at least 10) in San Mateo. A couple of years ago, he expanded to next door, unfortunately, his popularity grew as well, resulting in waits on weekends that can be as long as an hour.
But there is a reason for popularity - it's the best sushi on the peninsula, bar none (I've been to many). For me, only Kabuto in the city comes close - and they buy from the same fish monger, so their sushi quality is similar.
Try his seared Toro and dreamy Hamachi. Portions are generous, but not ridiculous. If you're in an adventuresome (and expansive) mood, just ask him to serve up whatever is best - he'll ask your preferences and tailor a sushi feast that will delight and expand your sushi repertoire.
prices are in line with bay area sushi prices; standard Japanese cuisine is also well above average and available.
I gotta go again soon.. Umm..