My rankings were: 1, 3, 2, 4.
I loved the first three. Die Hard is my favorite movie ever. I've owned it on VHS, DVD, and Blu-Ray. I'd buy it on Laser Disc if I had one. Vengeance is great. The cat and mouse chase with the riddles adds an intellectual layer that is absent in almost all action films. The second film is a pretty generic sequel, but has some awesome scenes in it. The last one was too ridiculous. The F-22 scene made the ejection seat scene with the 45 second fused grenades seem plausible.
Die, Mauky, Die.