Terminator Genisys was released nine years ago, and it wasted the Terminator franchises best chance at a reboot. From a low-budget action film with a sci-fi twist to a billion-dollar franchise with six theatrical installments, Terminator has taken many shapes and forms since 1984. Both The Terminator and Terminator 2: Judgment Day are considered all-time classic action films, whereas all other sequels had lots of issues and could not replicate the success of the first two films. By the time Terminator Genisys arrived in theaters, Terminator had already tried to reinvent itself three times.

https://screenrant.com/terminator-genisys-reboot-promising-failed-why/