Overall both games are great games but Half-Life 2 is taking the cake.
I'm sad that Doom 3 didn't really have music playing in the background like doom 1 & 2. However, i really liked active monitors to turn on the lights, open doors, and etc.. Doom 3 had a better ending than Half-Life 2.
Half-Life 2 seemed more scary than doom3 with those
spiders from Unreal.
Everybody have a Great Merry Christmas!
