I voted for Star Wars.
LOTR =garbage
Alien =Meh
Indiana Jones =Sufficiently good stuff.
Die Hard= tsk... come on now.
With trilogies though, one or 2 are bound to be crappy. For example the Matrix, the first was good, 2nd was crap, and 3rd was a steaming pile of mule manure.
Again, look at Jurassic Park, the first was real good, the 2nd, not as good but still alright, the last is again the manure from a pack-animal of some kind.
This brings us to Terminator, the only good one of those is T2 Judgement Day.