Okay Now That I Finished the game, A few things really need to be said.
The Ending while many found it too much of a cliff hangar leaves room
for a third Half Life which by the way make the world go round! $$$
The game in general was cool... Wish there were more "DOG" Sequences,

Folks,
Bought the DVD retail version of HL2 from Amazon.co.uk (in United
Kingdom obviously).  The game came sealed in a brown box, but the jewel
case itself wasn't plastic shrink-wrapped.