The thing i like about DOD is the strafing. Compared to other mods and HL itself it's so fast.. the default crosshairs are ghey though. You'll have to find some "fixed" ones for the easy headshots. A good place to get X-hairs and Scopes for HL and mods (CS,FA,DOD etc.) is
http://www.bullseyecrosshairs.com/hlsites.shtm
the page is really slow for browsing but worth it.