I didn't realize the series had been green-lit. I'll have to check it out.
It's not greenlit yet. Amazon have made 5 pilots available for viewing and viewer reception will determine which one goes to series.
As for Zombieland, I watched the trailer and a couple of bits made me laugh. My friend watched the pilot and said it was okay with a couple of good bits. I don't really understand why they're using the same characters as the movie because it will only suffer in unnecessary comparison.
I think they're screwed either way. If they had used new characters, people would complaining asking where Columbus, Wichita and Tallahassee are, and that it's not Zombieland without them.
Recasting was probably the best bet.. and if it goes to series, either these actors grow into the roles. or they don't.