Terminator 2: Judgement Day was a masterful sequel that blended special effects, a movie star at his most blockbuster-y prime and sick action sequences to make a movie that will be remembered forever. The problem with it though? It was too good. It ruined all action movie sequels after it.
In trying to reach the benchmark set by T2, action movies now rely too heavily on special effects and abuse the idea of sequels and end up choreographing action sequences over writing a good story. T2 was so fun it exposed how bad every other movie was.