I think the auto-tuning is used for more of an effect, and that's why it's so obvious (a la Cher). A lot of people do that an eurodance-ish songs. I can't speak for some of his other songs though, lol.
I really like the song. I bought his re-release and I've been listening to this all week. I think it's deficiently his best. I like the fact that these R&B artists are doing these dance-styled songs.
If you like this, check out Ne-Yo's closer. It's FIYAH!!!!!