There's also just enough wrong information about the firearms to be annoying.
Only if you aren't one of the 99.9999999% of people who will never notice.
The game itself was at one time available in stores. I don't know if it still is, though. If not, you can use Steam, Valve's (the developer's) program distribution system. It will downlaod it to your computer, after you pay the fee for the game (IIRC, $19 for all the Half-Life 1 games, and it is only a one time thing, not a monthly fee).
I'd personally wait until DOD:Source came out though. It is redone on the HL2 engine, meaning better physics and graphics, and thy are redoing all the artwork, and adding in a better lighting and shadowing system.