It's underwhelming in terms of hype, but it's a good ability. At level 50, capstone abilities tended to have a larger "wow" factor and were often huge parts of the class's kit (Lustrate for SCH, Perfect Balance/Dragon Kick for MNK, Trick Attack/Kassatsu for NIN, etc etc). Comparatively, a number of the level 60 abilities are fairly unexciting, and Carve and Spit is one of those (so is Dream within a Dream).