I didn't think it was that bad. A little slow in places but I certainly didn't find it awful.
It was an experimental episode. It could have been better and, for me at least, could have been a lot worse, too. I think it would be a great shame if the general fan reaction to this put an effective end to experimental stories. Formulaic, tired and uninventive Who will stay dead a lot longer than uneven, sometimes excellent sometimes rather less so, Who.
It will be interesting to see what happens in the equivalent episode next year, particularly as they are less likely to have a character like Jackie around, I suspect. A Torchwood based episode instead, perhaps? A bit like they did in X-Files a couple of times with the Lone Gunmen and little or no Scully and Mulder?
As for the 'blow job joke' - you all have dirty minds! Could he not have been referring to just sharing the odd kiss? Besides, I'd imagine she'd have a rather rough tongue and lips..!