Hmm, you may not like the other ones. They sort of get gradually worse, unless if there was something that you liked in the previous 3 instalments that is focused in one of those. The fourth and fifth were pretty decent although I liked it better when Jigsaw was alive. Saw VI was also one that respected the first 3 movies and how they tie in with that one. Saw: The Final Chapter, however, was a hit and miss. I won't spoil it since you haven't seen the movie but that one was probably the only one that I can agree with that is quite bad. So, my final answer is you could check them out if you don't wanna miss out but have low expectations. Me, personally, I really like this series, even if it's got it's flaws.