I actually quite liked Die Hard 2. The story was absurdly ridiculous (the idea that the Colonel can plan everything that happened, including a fucking pivotal snow storm hitting right as the drug dude flies into the country, was beyond insane,) but the action was tight and I really liked the airport setting.
The third really didn't do much for me. Samuel L Jackson's character just felt like a caricature to me, and their constant bickering got on my nerves after less than five minutes.
I thought the fourth was actually really enjoyable, if you managed to ignore the whole "Sir, we are being hacked on all internets simultaneously!" nonsense. (Why don't they ever hire some consultant who understands computers to tell them "Guys, this is bullshit. This isn't how the damn internet works!") The only thing that really made me roll my eyes was the absurdity of an F22 pilot blowing up half of a fucking city to try to stop a "TERRORIST SEMI TRUCK!"