The Dreadball minis have not been designed for high pressure casting and neither have they been designed to fit on fantasy legs. That means they can get away with more undercuts and be made 'bespoke'. There has also been more time to get used to the restic material so understanding what detail can be put into the sculpt has helped them to be better miniatures.
Mantic are going to be updating the Forgefather range in 2013 to all have similar proportions to the restic miniatures (so they will be smaller)... this may help to improve the quality and also compatibility of the range.
... but in the mean-time, here is Big Frank:

He will join the Berserker's unit and will get his base finished when the rest of the unit is finished.