No it's not good. I guess a lot of people like it, a lot of people hate it... and I fall into the hate it camp.
The problem is the plot, as so many others have no doubt pointed out. It makes sense on the surface level... and is so absolutely surface that when they try to add a twist or two it come across as an insult to the viewers.
It is one of those films where the entire responsibility is left on the writers, the plot just doesn't work for an Ocean's movie. The twists don't work. They tried to re-capture the magic of the first one, and, although the 3rd was able to do it well enough, 12 fell flat.
So, watch it to be a completionist and then forget it was ever made.