Trigun: Badlands Rumble
Little more than an extended episode of Trigun. If you liked the tv series, you'd probably like this.
In some ways, the returning characters are a little pointless, as they're simply there because you expect them to be (Meryl, Milly and Wolfwood) and they don't really do anything to advance the story. But it is nice to see they've retained all of the old seiyuu in their roles from the tv series.
It is also nice to see they haven't forgotten that Trigun is about absurdly violent gun action, but over the length of the movie, these moments are too few and much of the intervening time is spent with Vash doing his dummkopf routine and trying to chat up the film's resident vengeance-seeking girl, Amelia....
King of Thorn
With the manga pared down to something that will fit in the space of a 90 minute film, you lose quite a bit around the edges that made the original King of Thorn manga worth reading. What is left is a survival horror anime that spends a great deal of time introducing characters before killing them off, one by one, without really giving you any reason to feel for them. And the explanations for what is happening, and why, are convoluted and difficult to follow.
That said, it is still a lot better than many other contemporary films I can think of....