SERIES PREMIERE: There’s something fairly unsettling about this new FX comedy – but there’s something unshakably unique about it as well, which makes it very watchable even as watching it may make you occasionally uncomfortable. Aggressively cynical, narcissistic and self-destructive characters are not new to sitcoms – Krysten Ritter’s comically abrasive character in ABC’s Don’t Trust That B---- in Apartment 23 being a prime example. But in this new series, Aya Cash’s character of Gretchen would intimidate, if not destroy, Ritter’s tough gal in a heartbeat – and Chris Geere, as her male equivalent, is just as prickly. Can these two find true love with one another? Perhaps – but only after a marathon night of what both parties agree is a bout of meaningless sex. The performances by these two leads, and the writing by Stephen Falk, are daring enough to deserve notice. But as with shows like The Sopranos, just when you start to embrace these characters, they do something to repulse you into retreating to a safe distance.