That they misrepresent the religion to people--someone is a Jehovah's Witless, so that means you can abuse that person all you damn want and they won't care about it.
The wasted time and energy in field circus.
Repression of everything that qualifies as normal. You aren't even supposed to look attracted to the opposite sex or to items that pertain to Christmas that look attractive.
That they imposed stupid rules, with stupid logic, and breaking one is somehow tied to breaking a Bible command. One example is "stealing". They claimed that I could "steal" the word of God if I didn't, at great personal hardship, spend all my time spreading it to everyone or if I could have tried a bit harder getting others to believe the crap.
Later, that though I seen the territories being worked through multiple times, nothing seemed to be getting reduced in size. I didn't succeed in even reducing the number of doors per territory left to be worked.