The things the Watchtower offers, as far as religious doctrines, which people find appealing (and which are actually Biblically accurate), are:
* No traditional Trinity
* No eternal torment in Hellfire
* No Calvinistic Predestination that makes God be portrayed as more evil than Satan.
* No complex Rapture theories (except, well, now they've made a complex Rapture theory for the Anointed)
And actually, all of them highly debatable.