Slab Rat comes dripping with praise from various highbrow publications, including one cover quote comparing it favourably to Heller's father's most famous work, Catch 22. This is unfair on him (who can compete with a cultural landmark like that?) and even more unfair on the reader, as expectations can only be dashed.
And dashed they are, but not necessarily because it's a bad book. On the contrary, it's well-written, pacy and readable. But it's throwaway fluff, and derivative to boot. Billed as satire, this is a story of Manhattan office life in the high-powered, superficial world of glossy magazine journalism. The satire, presumably, stems from the fact that everyone is selfish, jealous and happy to scramble over others on their way to the top. Not least our protagonist who has lied about his background and is quite happy to watch his best friend go slowly insane, as long as he can benefit in some way.
It's only satirical, however, if you work in publishing and get the references to feature commissioning and review writing. Otherwise it's just a caricature of slimy yuppies, which means that it comes across as American Psycho without the serial killing or graphic sex. My recommendation would be that if that floats your boat Kill Your Friends is far funnier, more coruscating and genuinely satirical without being a horrible read (American Psycho's downfall). And if you want real, life-changing satire, Heller Sr knew exactly how to do it.