It takes a while to adjust to each change of the Doctor Who actor and to the companion(s), too.
At first, I didn’t think Smith would be as good as Tenant, but I have gotten used to him now.
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This episode had some good lines:
DINOSAURS! ON A SPACE SHIP
DOC TOR, DOC TOR WHO? DOCTOR WHO? DOCTOR WHO?
I've gotten used to him ... but he isn't as good as Tennant. Or Eccleston. Or David Morrissey, for that matter.
Likewise, I don't like the version of River Song we get to see now. She's somewhat removed from the version in the library (even though she's older in the library).