Comparing 'Sequels To The Movie Saw'

Sequels to a movie are usually said to be bad by the critics. But this time the sequel blows the original out of the water. There were many differences in both, but some aspects were still the same.
My friend told me that the first "Saw" was quite horrible, but I decided to see it for myself anyways. The plot to "Saw" was about a young man named Adam, played by Leigh Whannell, who wakes to find himself chained to a rusty pipe inside a dirty utility room. Chained to the opposite side of the room is another captive, Dr. Lawrence Gordon, played by Cary Elwes. Between them is a dead man lying in a pool of blood, holding a gun in his hand. Neither Adam nor Dr. Gordon knows why he has been abducted. There was a cassette tape left for them to tell them the instructions of a game
The instructions told Dr. Gordon to kill Adam within eight hours. If he failed to do so, then both men will die, and Dr. Gordon's wife, Alison, and his daughter will be killed. Recalling a recent murder investigation by a police detective named Tapp, Dr. Gordon realizes he and Adam are the next victims of a psychopath known as "Jigsaw." With only a few hours left to spare, they must unravel the elaborate puzzle of their fate. The killer has provided them with only a few clues and two hand saws. Dr. Gordon finds pictures that Adam took of him because he though he was cheating on his wife. Since the chains are too strong to be sawed, they had to think of another way to escape, so Dr. Gordon saws through his leg and leaves his friend to die. Parts of the plot seemed interesting, like how Jigsaw "killed" his hostages, but I wished it would just end. Everything seemed to drag