It's not bad but it's certainly very meh. Johnson threw everything Star Wars fan-boys know and love about the franchise out of the window and made it his own...which, wasn't the cleverest thing to do in hindsight.
There are some really stupid bits in it and poor John Boyega, who was so terrific on TFA, had little to do apart from a side quest to Las Vegas. Johnson reinterprets what the Force means/what it can do which made one moment in particular seem f**king stupid. That said, there are a couple of cool scenes.
But give me Empire, Force Awakens or Rogue One instead any day. Far superior films.
That's the problem with changing directors- tone and nuance shift so dramatically from film to film and the outcome isn't always good. For example, Bond- Casino Royale and Quantum of Solace. Are you telling me that if they'd retained Martin Campbell to direct Quantum too, it would have turned out like it did? No. Instead Marc Forster took the reigns and it was just a mess.