I recently caught Less Than Zero (1987) on TV. I'd never seen it before--nor read the Bret Easton Ellis book it's based on (though I am familiar with the Elvis Costello tune it's named after). In fact, it was not a hit, and was not treated well by the critics, so I wasn't expecting much--and the film delivered on that promise.
Clay starts sleeping with Blair (who's a model, by the way) while Julian goes downhill. He comes from money, but his family has cut him off, and he can't afford to pay his drug bill. So Rip forces him into prostitution. Clay saves him from the life, but Julian dies of heart failure. Oh well, at least Clay and Blair may turn out okay.
McCarthy is a problem. He's the good guy, but has no edge, and little chemistry with his costars. He and Jamie Gertz bump and grind in all sorts of ways, but their relationship is mostly marking time in-between the actual story. McCarthy has a red Corvette, practically a character itself, that he keeps stopping in the middle of the streets of Los Angeles (often to fight with or make love to Gertz) which are so oddly underpopulated that no one slams into him.
The characters who do register are Downey, Jr. and Spader. Downey overdoes it, but in a film where so many seem zonked out, at least he gives you something to look at. (Today it also plays as a premonition of the life he was about to lead for some years to come.) And Spader is fun, as you'd expect, since even this early in his career he was playing the "Spader" role.
So I can't recommend it. I doubt many would. But if you watch it as a bizarre artifact of the 1980s, you might enjoy it.