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Saw 2 and 3.
Saw 2 is worth watching. Not for the ending, like the first one, but for the process; the ending isn't impressive.
Saw 3 is garbage. The adventures of the test subject are made without any soul; the pseudo-philosophical sentences are cliché and worn out; the final monologue is simply pathetic; no one is pitied; everyone is expendable; the ending is of the "lol, what else can you say?" variety.
Neb, if you haven't watched this movie, but decide to watch it sometime, don't bother watching anything beyond the first part; it's hardly worth it.