This is difficult :/
5 - Giving talks.
4 - 2 - 4 day assemblies. Even the 1 day assembly is torture. Sitting there listening to the same old crap. Most boring thing I've ever seen. And if you're like me, you have to pay for a hotel room and food... so... wasted money for nothing.
3 - Field Service. I dislike waking people at 10 am on a Saturday only to be told that they are not interested, which proceeds by my preaching partner using everything in the book to over the conversation stopper.
2 - Personally, I haven't seen a young one get disfellowshipped, but I think that's sick. That kind of behavior towards a child will cause some severe mental harm, especially when they're in their most impressionable years.
1 - I've only seen a handful of these. But, young ones getting baptized is just dumb. They have no idea what they're getting themselves into nor are they qualified in any way to be an "ordained minister" of God.