a slight error of judgement?
Seriously, whilst I think Who taking a bit of a break wasn't a bad idea, I think the idea of the specials hasn't worked well. In the main this is for two reasons.
1. Both PotD and WOM kind of hang there alone, unconnected to any wider story.
2. Neither of them felt particularly special.
Don't get me wrong, I liked both of them but, unlike The End of Time, I didn't think they were anything special. As epsiodes within a wider season long context I think they'd have worked much better. In fact imagining PotD as the season opener, with Michelle Ryan staying on as the year's companion would have been great. Similarly WOM acting as episode 11 of the season, possibly after something horrible happened to the companion the episode before, would have worked much better, and been a nice lead in to the final two parter.
I think, rather than the stand alone specials, they'd have been better off with a truncated series ala Torchwood Children of Earth.
Just my two pence worth.