I have never been overly enthusiastic about Generation X compared to some of the other bands from the 70-80s era. For example no one can compare to the Sex Pistols for the 70s and in my personal opinion the Dead Kennedys were the highlight of the 80s.
However, this album is well worth getting. Billy Idol has an amazing voice and the vocals are great. Classics such as King Rocker do get stuck in your head with very good riffs and tunes.
Perfect Hits is a good album because it has all of Generation X's finest singles with a wide variety of different sounds, but all definitely catchy and listenable. The Untouchables in my opinion is one of the best Generation X singles and with other unmissable ones such as King Rocker, and Dancing with Myself. This is a definite album to buy if you like Punk or not, but it is one hundred percent an essential punk album.