It looked like they just cut their effects budget by a lot. The green screen work was terrible and super apparent. The motorcycles would be obviously riding in a studio instead of on sand (just look at them not affected by any bumps).

A bunch of the CGI was just super obvious and in some places poorly done.

And then the plot had the random love interest and most of the dialogue was bad.

And worst of all

Then at the end when they show scenes from the last movie, it was just so obvious how bad the effects were in comparison!