Analysis could include

• player engagement 
• balance (i.e., difficulty level)
• control (i.e., players make choices that affect the outcome)
• rewards (e.g., scoring, advancement through levels, animations, random rewards)
• goals and feedback (i.e., games that provide clear, achievable goals and useful feedback)
• marketing.

Process/Skill Questions:

• What are the criteria to determine whether a game is successful?
• How do player engagement and feedback influence whether a game is considered successful?