While Kill Points make a few choices from each army less than viable, there's only one army that they truly screw over ...
Imperial Guard!!! Your compulsory Troops choice is worth a minimum of three kill points, and god forbid you want to run a Guardsman-heavy army like mine with two platoons of three squads each (plus Hardened Veterans and two squads of Storm Troopers). I hope the new Codex beefs them up some (March can't come fast enough!)