Yes, the aliens are still there, the time-travel's still there, but the contrived science behind the show is getting increasingly far-fetched. Nurse-mermaids entering from parallel universes due to a simple reflection? What happened to the TARDIS nearly dying when the Doctor last tried to cross parallels? Or the fact that David Tennant sealed them off?
Don't get me wrong, I still love the show, and Matt Smith is fantastically filling the considerably large boots left behind by Tennant. Like Tennant, he seems to have a dark, nasty side underneath the mountain of quirks. He's the college professor everyone craves, and the ADHD kid everyone loves, all wrapped into one; topped off of course with a lavish helping of good ol' British cheese.
The season has started off fantasically with the two-part Silence episode (yes, Moffet has added more reasons not to sleep at night), I felt the pirate episode to be a bit of a lull, but Neil Gaiman's 'The Doctor's Wife' was a fantasic episode, as required by now from an amazing writer.
We expectantly await more.
Over and out.