Well, one of my 'guilty pleasures' are spaghetti westerns.
I just love them. I love the baroque nature of the gratuitous and wonderfully choreographed violence, the arid, baking landscapes (I detests studio bound westerns), shot in the light of a searing, white hot sun, the slightly sinister yet wonderfully gripping music, the cheerfully utterly amoral plots, the iconic yet clichéd characters…….the cinematography, well, while many if not most of my other leisure pursuits are unashamedly highbrow, yes, I must confess that I love spaghetti westerns.
However, I do not view my great affection for much of the Star Trek franchise as a guilty pleasure, because it ties in with other, serious interests; in general, I am interested in space, and fascinated by space exploration and discoveries, & related scientific advances, and devour books and articles about such things; Star Trek is just a fictional off shoot of this interest, and I simply enjoy it.