How fun can it be? I barely see them use any other skills besides throwing rocks and using the same skill over and over and over again. This can't be what the Sage is built for.
Kind of answering your own question there boss.
Many players make sage boring to play. Each of the pure specs can be reduced to 4 abities. You can make good parses using nothing else.
Truth be told, most specs for all of the ACs can be reduced to just a small handful of abilities. But that is never going to make the most of any AC or spec, and it's not playing well.