Time travel can be cool and work well in a film or series, or make you feel dumb and story unsatisfactory.
For me, the Back to the Future trilogy is time travel done well in fiction storytelling. But often it is confusing. And can also be a buzzkill if one cares reasonably enough about a franchise/ universe.
The first of the JJ Abrams reboot films was a lot of fun, one of Abrams’s best works in fact, but then again, why should we accept the newly revealed fate of Spock’s home planet and race? Or of Kirk’s upbringing?
Doctor Who and its constant going back and forth in time since its modern reboot, and seemly being okay to interfere in human history in light the hearted episodes, but not so to change the fate of his missus or his assistants because cataclysmic consequences to the space-time equilibrium and blah blah, also confuse and frustrate the hell out of me.