I beat it last night for the first time.
The battle at the end makes the game, IMO.
I was impressed witht he ending movie, def a cliff hanger, and now im loking forward to the other 2 games, regardles of what music played during the credits.
IMO, they paid attention to what mattered, and may have skipped the details, but its still an awesome game, and the first FPS that ive been into since PDZ.