That's pretty much the trade off with warrior. You get fairly high damage output, lots of defensive cooldowns, crazy self healing and... godawful mobility. Holmgang, while great, can be purified, and its very tempting to do so. Its just so much fun to run around with that tether for 6 seconds while the warrior is rooted in place xD Ive also noticed that if a warrior holms me while I'm sprinting it often doesn't pull me all the way into melee range.

Bunny hopping used to be a major exploit and was supposedly fixed, but I think it does still interfere with lock-on target. Idk. I find it hard to believe people do it just to be cute.