Fun story. I played a pally on my first run of Shattered Star. (Once as a player, now I'm DMing a run of it with a different group.)
My Pally followed Sarenrae, who is moderately obsessed with redemption. So When stuff wasn't evil, but was still on the wrong side of things, I'd try and sit them down and talk about their life choices. Which ended up with some fantastically hilarious situations.
there are also plenty of unrepentingly evil funsies in the AP, but moreso toward the later books.
So if you want to play a more evangelical type pally, then I think it'd work great. But a Paladin of Torag might have some problems.
And if you opt to play a Paladin of Sarenrae, (or any divine character of Sarenrae) I made these fun little pamphlets for a convention one time. https://www.dropbox.com/s/iunkzsvm53iqe52/Sarenrae_Pamphlet.pdf?dl=0
I didn't end up being able to go, but they've been fun to print out and take to some of my local game groups...
DM: Okay, we'll go around an introduce yourselves.
Eventually gets to me: I am Jezriel, a humble paladin. Have you heard the good news of Sarenrae? /hands out pamplets to everybody.