The thing I dislike the most is that my bot got banned. I made a bot to post carefully categorized articles into their proper communities, but it was banned without warning or explanation. All the communities I was modding dried up shortly thereafter because I didn't manually post in them instead.
Im pretty sure most people including mods don't want to see a bunch of soul-less bot postings. That is straight up community manipulation. Please don't use bots, use your human mind to interact.