Spider-Man 3, Allegiant, and Solo are all prime examples of movies that ruined franchises. That may seem like a wild claim to make, but truly, all it takes is one massive box office bomb to terrify studio execs and shelve a franchise for good. On some occasions, a movie can perform well at the box office but receive such negative reviews that a studio becomes too afraid to put out another installment.
Often, the story is the same. A movie is made, and it's really good and pretty successful. A sequel is then made, and that one is even more successful. At that point, the studio gets involved because they have so much money on the line, and the sheer amount of meddling these suits do ends up creating a terrible movie and tanking the franchise as a whole.
Vote up the movies that were so disappointing, they put the kibosh on future installments.