For a BBC production I think it's excellent, but as a veteran of the very first episode I suppose I would say that. The comments I've read seem to agree; there have been a few that thinks it's complete tosh, but they're very much in the minority.

What one does need to bear in mind is that Doctor Who is (and always was) "family" entertainment; and geared more towards the younger members at that. Don't expect anything too deep; it's more for stimulating the imagination than the intellect.