Final answer:
Hurstwood is skeptical about Carrie's depth as an artist and her ability to give a truly impactful performance, focusing more on style rather than sincerity.
Step-by-step explanation:
Based on the provided information, we can infer that Hurstwood does not believe Carrie will give an excellent performance. Rather, he thinks that Carrie possesses a good form, but he questions her ability to convey genuine emotion through her art. Hurstwood's thoughts indicate skepticism about Carrie's depth as an artist, hinting that she is more focused on style rather than sincerity and lacks the selflessness he feels is necessary for a truly impactful performance.