G16s2

Sharp mind isn't always successful, and ranking the skill doesn't increase how often it'll work. On top of that issue, sharp mind is limited to revealing only skills that your character knows. So even if sharp mind "successfully reads" a monster's skill, it won't reveal it unless your character has it to begin with (like the earlier example of a golem using stomp: you won't see the stomp skill icon above the golem's head unless you're a giant that can use stomp). Sharp mind's limitation, although it makes sense, is the reason why it's broken and next to useless (as a skill) once you start fighting a larger variety of monsters. Experienced players, and I don't mean level wise, are usually able to predict what skill a monster is using (or at the very least, rule out at least 15 skills as a possibility).

Experience > sharp mind