I agree with near all the points presented. I thought I was one among few who dislike HL2's story.
For example, I was highly appauled at Gamespy's(?) Half-Life2 vs Halo2 when they rated HL2's story better than Halo2. I was screaming in my head "What goddamn story!?".
Valve seem to be concentrating on character development. Usually however there is a plot as well as character development, a fact they seem to have missed.
There is still no evidence to what the hell the GMan is about. With assumptions, the most I concluded was that he's running some type of interdimensional mercenary business. One would of thought the Gman would of been explained after HL1. But instead they provided many more questions and a handful of answers.
As for puzzles. I don't mind the odd simple puzzle. But I kind of disliked the old hard ones. They were more frustrating than entertaining IMO. Maybe I'm just stupid though.

I do believe its possible to re-integrate them back into todays games. But care needs to be taken to avoid frustration from exceedingly difficult puzzles. There are some tricky puzzles in KOTR2 that perplexed me for a while. Here I am at 2am sitting on my bed with a calculator, trying to work out some damned maths puzzle.
I think more dynamic and inventive puzzles would be more successfull, rather than the old school 'learn quantum physics 101'. Though I do agree, they have a place in games. Maybe with
optional sidequests and the like which unlock extra goodies or something.
But yeah. When math quizzes pop up for someone who hasn't touched a calculator in years, curses are bound to slip the toungue.
