I don't know about all of that. I wouldn't read too much into it at all. I have been downloading torrents for awhile now myself and usually those stuck at 99% are due to old or badly shared torrents (repost torrents you like, it keeps them healthy). Then you have a bunch of people waiting for someone to share that last 1% because the intial seeder either couldn't afford a seedbox or doesn't go through his torrents and reseed on occasion. Another thing about seeders, sometimes when I am not downloading I seed a bunch of torrents but I don't choose who I upload to and who I do not, my torrent client (utorrent) does. So it may honor requests on some seeds and ignore requests on others, I couldn't tell you why. Usually 99% is perfectly fine to view a video, ( I have viewed a videos with only occasional static at 70% before), and I am sure it is frustrating when that last percent prohibits you enjoying the vid. Try VLC, if you are not using it already, it can sometimes fill in the gaps other players need to play a broken video properly.
A note on "antis": there are none. What we have is a bunch of money hungry bastards who don't like people sharing for free and them not getting any money out of it. They don't want to stop you from downloading torrents, they want you to pay them for what you are downloading. Almost all anti-piracy firms are money orientated in one form or another. If no one is trying to get money of you, it might be a hacker but it isn't an anti-piracy firm. They might go after torrent sites, as long as someone is paying them to, but they likely are not going to try to stop you from downloading a torrent. There is just no money in it for them.