Yes, MW was substantially nerfed due to this credit new BS. The worst I've seen is on my GT650 paired with an i7 Ivy core, getting only 154 credits for 35 min crunching on a task, the CPU isn't so bad, around 2 hours for 159 credits (aprox 79 or so credits per hour), though I remember getting 200 credits per task on a much slower CPU (core 2 duo 1.7 GHz) which with an opti-app completed it in 1.5 hours for 200 credits...

I can only imagine these frackin credit parity people hit MW and hounded them till they nerfed their credits. On the GPU side, on nVidia cards, they're like the absolute worst credit granters out there, hands down, now....