They always make fun of Bart or Lisa and almost never get their well-deserved comeuppance. And even then, they never learn. Yet people include them in pairings. Overall, the twins have a likability quotient of zero.
BTW, I don't know this question has to be created in article form. --Kid Sonic (talk) 22:52, March 12, 2013 (UTC)
They are most likely mean-spirited expies of Patty & Selma (in child form). As for them being spoiler/the whole perfect angels facade, it's most like due to their uptight/doting father (Homer's former boss in the SNPP technical supervisor/supervising technician division).