The plot is terrible. The most generic first person shooter I've ever seen, complete with African-American scientist, buxomy girl who is not what she seems, and giants with rocket launchers grafted to their arms. Seriously, I think we've all seen enough giants with rocket launchers grafted to their arms. Next!
However, the gameplay and graphics are amazingly good; especially the gameplay. It's so refreshing after Doom3 to be able to sneak up on enemies and kill them, instead of enemies sneaking up on you. And killing you. Messily.
On the other hand, Half Life 2 is still my favorite game of all time.
