Come on, it has Mary Elizabeth Winstead in it, which means it can't actually be bad.
Besides, it's brilliant. Signature bad guy and badass henchperson. Wisecracks. Unwilling sidekick. Gradual accumulation of injuries. And a bonus boot-up of movieOS. Everything you need from a DH film.
It's the last one which, tbh, the erasure of which from history ought to be the prime motivation for inventing a time machine (and evidence that time travel can't exist, because that's the first thing anyone would have removed from history, then Hitler and stuff). They should do all the Terminators other than 1 and 2 also.