It's only bad when you have a DH/DK/Druid tank in there. Especially when they've completed the World quest and are just there to annoy people. The Murloc one i find more annoying as it's the one where most people team up on so it takes a while to complete. Bareback Brawl is a caster's best friend with the mountable creatures. And hardly anyone can be bothered to go to the highmountain arena or it spawns at a late time, so that takes about 5 minutes.