How bad is it? It's a stunningly bad "desperately trying to be cool" film.
Should you see it? If you long for a 1960's time capsule, maybe.
Groucho Marx plays a mob boss and disrobes a young woman while reading cue cards. Jackie Gleason is a hitman who is kidnapped into prison by Cesar Romero and Frankie Avalon. Most of the movie is about taking LSD; Gleason drops acid and has phantasmagoric visions, including dancing garbage cans (easily the high point of the film). Carol Channing plays Gleason's wife. Others that show up: Frank Gorshin, Peter lawfor, Mickey Rooney, Burgess Meredith, George Raft, Slim Pickens and Richard Kiel.