1. I deduce that Shoulder Tackle is a useful skill as it is right now because I find use for it in almost every level 50 instance.

2. Tell your tank to pull faster.

3. Use Featherfoot and you will get to use Haymaker on things that use melee AOE or cleaves. I use Haymaker on Garuda, in coil, and even on Titan on occasion. It's also a fantastic skill while soloing.