It's not as full-featured, but it's got some nice tricks. I've had no issues with the arms or legs compared to other rigs; it's important to make use of Full Body or Body Part modes along with the occasional pin.
What kind of weird motion are you seeing? You may have missed a step during setup, HIK requires that the arms be totally straight. So if you were coming from an A-posed skeleton, you'd need to get it to a very tight T-pose before creating the HIK rig.
The pluralsight ones are decent enough for getting familiar with the tools in Maya and the general process. I've done those and no other rigging tutorials, and I know enough to get humanoid characters working half-way decent in a Unity game. I couldn't realistically apply for any rigger jobs of course. The pluralsight…