It was great if you like the rest of the Saw movies. I don't know if someone would enjoy it if this was their first Saw experience, however it does pull in a lot of scenes from the others in the series so I think everyone could enjoy it. It is a horror movie but it does not have more gore than needed for the plot.
I agree with most of the other people. I go to the movie very frequently. This was by far the worst movie I have seen in quite some time. The only good part was when Eminem and other people made a cameo in the movie. The language, as others have said, is a little excessive. The comedy really isn't even where it should be for the caliber of comedians in this movie. The plot is what kills it because it just drags on.