It wasn't a bad episode, and I likes the Ood, etc but....what did the Dr actually do to help them? Apart from turn off the bomb - which Sigma Ood could have done just as easily? As far as I could see the Dr and Donna just got chased around a bit, cracked a few funnies and did a bit more screwdrivering......nothing really to merit being remembered by the Ood for eternity.
And another thing (while I'm in SF geek mode), if the processed Ood had had a 1/3 of their brain chopped off how come they appeared to be acting exactly the same as the raw Ood at the end? Surely they either need the brain on a string or they don't?
Thirdly, would humans really make slaves out of the Ood? Surely any average human, given a few 'raw' Ood, would just try to get them drunk and encourage them to play conkers with their brains on a string?