Generally agree with gdog on T-3. Was a worthwhile effort, if obviously nowhere near the first two, good companion piece to them, good ending that fit it in well with them. It's also somewhat hilarious now to see Claire Danes in it after Homeland. She often acts like the same character with her screaming.
Watched about 10 or 15 minutes of Salvation once, found it totally unwatchable. Best thing that came out of that movie was probably the audio recording of Christian Bale flipping out on some cameraman during filming, he obviously took it pretty seriously.
Based on what I've heard of this one, will likely avoid (not that I get to many movies like this much being married with small kids anyway).