I don't know if I'd go as far as saying that Saw 3 was a let-down, but it definately felt different to the first two. As commented on further up, the first film traded more on the psychological element of each scene, rather than just going for gore. To a lesser extent, it can also be claimed than Saw 2 was the same. Saw 3 on the other hand went for gore to an unnecessary degree. Saw 3 remains the only film I've ever had to turn away from because the gore was so bad. As a self-confessed horror film fan, I'm not at all squeamish when it comes to gore, but Saw 3 simply went too far. I still enjoyed it, so wouldn't call it a let-down, it's just they forgot it was the psychological element, not the gore that made the first two films what they were.