10 reason half life 2 is one of the best games ever

[Reasonable]

Best FPS ever - in fact through the power of Steam I'm replaying it on my laptop while travelling around Europe, and it still looks good even downscaled a little so the laptop can handle it.

Playing it again has slightly depressed me though, as suddenly Gears, Killzone, etc. seem rather pale by comparison to the SP campaign in Half Life 2. Why can't developers get such great SP campaigns out the door anymore? Is it the additional cost of needing a killer MP side to the game as well? I wish I knew, and I wish someone would try and top Half Life 2 - apart from Valve that is as they're busy trying that in installments and doing an pretty good job so far.