I liked it a lot. It’s pretty much a comedy, albeit a heavy-hearted one. As a drama, it’d be slightly too simple: we never truly understand the exact nature of Albert’s speech impediment or its causes, since both physical and psychological remedies both help somewhat, so there’s no real narrative to that element. The plot is simply that it becomes increasingly important he be ready to take the throne, and his speech continues to be a problem until it isn’t.
Which is fine, because it’s funny. Helena Bonham Carter is charming as the queen mum, Geoffrey Rush has some fun with the class difference, and Colin Firth shows an entertaining disdain for aristocracy and also swears and sings.