blacklight: retribution's hrv system is what made it truly special, and perhaps my favorite first person shooter, period;
allowing all players a wallhack-equivalent mechanic gives them enough information to make good decisions;
other games have issues with information asymmetry and general lack of direction, which leads to players wasting time or feeling that there's nothing they could do against an opponent;
blacklight also made early attempts at mech-versus-pilot combat and detailed weapon customization systems, both of which would later be improved upon in other shooters;
it is a true shame that the official servers have shut down, and i long for the day i may again play with everything on my hrv display