Because Americans are fat rich bastards with 4000$ PCs who only play CoD4:MW2, Crysis, DIRT2 and games like this. HL1 is so old for them that if you ask them if they heard about "Half-Life" they'll tell you:
Half-life is the period of time it takes for a substance undergoing decay to decrease by half. The name originally was used to describe a characteristic of unstable atoms (radioactive decay), but may apply to any quantity which follows a set-rate decay.
The original term, dating to 1907, was "half-life period", which was later shortened to "half-life" sometime in the early 1950s.
Of course, most of them will probably just say the game sucks at graphics, I repeat, being fat rich bastards that have no respect for old games that where glorious for their times, completely proving faggotry and forgeting about the feeling of nostalgia.
Sorry, I'm a little angry here. FUCKING ED, THAT SITE SHOULD BE BANNED, I FUCKING LANDED ON THE OFFENDED PAGE BY MISTAKE.
I feel like watching Tom&Jerry now to calm myself