Along with Green Day's Dookie, Offspring's Smash was one of a very few punk albums that managed to become a major crossover success in the early 90's. It doesn't seem like a big deal now, but before "Basket Case" and "Come Out and Play" paved the way, punk was a scary outsider movement that was largely untouched by the likes of MTV and Clear Channel.
Far-reaching implications aside, Smash had two really big hits in "Come Out and Play" and "Self-Esteem" and rounded out the album with decent cuts like "Nitro (Youth Energy)" "Something to Believe In" and "What Happened to You". Smash is an evenly-balanced punk record with enough of a hint of standard rock to be palatable to non-punkers. Because it happened at a time when such things were rare, it's hard to oversell this album's importance.