Maybe this has been mentioned before, but I'm gonna re-mention it in hopes of getting the attention of mods and the community.
The warg skill rallying howl does not work correctly. You're supposed to get and increase tier to the damage buff for every warg in the pack that howls. Currently the damage buff stays at tier 1 no matter how many wargs howl.
I have never seen this work right since I have been playing. That's about 3 or 4 major updates! You would think Turbine would catch and fix this one after maybe 1 or 2 updates. I would love to see this finally fixed.
I think there are a few other skills on various classes that don't work. Feel free to mention them here.