It was a good movie, thrilling, good mystery-puzzle and all that. I am a fan of the Saw series, I just don't see a reason why make a sequel to that and continue it while unnecessary and ruin the ''legacy''! And from what I can gather there will be Jigsaw 2 3 etc. It is a good movie, but not as a Saw sequel.
Otherwise I recommend watching it to Saw fans.
PS: The graphic works could be better.