First one was terrible imho. T2 was good, the others meh
OK, of course I've watched both multiple times:
T1: 4x
T2: 3x
Didn't bother with T3.
Rotten Tomato rankings last time I checked:
T1: 8.6/10 ... 30 fresh / 0 rotten
T2: 8.4/10 ... 25 fresh / 1 rotten
Those are high rankings.
It's been observed that the theatrical cuts are definitely superior to the director's cuts for these films.
IIRC, T1 put Arnold on the map, set up his huge career in the movies. The history of how it came to be made is an interesting read.