I don't think it was the worst episode I've ever seen, but I agree that it wasn't that good.
Which is a bit disappointing, because it had some potentially interesting elements. An alien civilization living in an asteroid belt (which they ruined by insisting on referring to the asteroids as "planets"; although I suppose if life developed on an asteroid it would probably consider the asteroid a planet) and a living sun were some interesting ideas. And the whole "we are keeping watch over a sleeping monster in a pyramid" thing
could have been a lot more interesting...
I didn't mind the Star Wars style alien marketplace scene- it's not like Doctor Who
hasn't done similar things before.
The TARDIS translation circuit- well, I saw some theories that maybe it's
not working for Clara because the TARDIS
actually doesn't like her, which would be interesting. However, somehow I doubt that there will actually be an explanation... we could handwave and say that it's just not being translated for the audience, like the Hath in The Doctor's Daughter?
As for the sonic screwdriver... this is becoming more and more annoying. In Power of Three, for instance, the Doctor saves the day by waving it at an alien computer and causing the ship to blow up and resurrect a third of the Earth's population. (which was a somewhat disappointing end to an otherwise decent episode).
Also, I liked the first two Martha episodes. But maybe that's just because I liked Martha as a companion better than most of the others.