Plot is one of the most nessisary parts of making a great mod. If you lack plot you lack players. I should HOPE that someone who took the time to make a Single-Player mod focused on the plot. Games like System Shock 2 have shown that a fantastic plot and heavy immersion can be one of the best experiences out there. Like in They Hunger.
Scripted events are sweet.
Cause you and I both have no clue how to make one. I think of them the same way I think of colored lighting in maps. Use 'em only if you know how to do it well. Ok so he doesn't seperate himself form HL but damn. This guy is awesome.