•    Fails to handle error conditions gracefully
•    Unused flags
•    Missing or duplicate functionality
•    Reliability Issues. Difficulty in connecting and getting a response 
from API
•    Security Issues
•    Multi-threading issues
•    Performance Issues. API response time is very high
•    Improper errors/warning to a caller
•    Incorrect handling of valid argument values
•    Response Data is not structured correctly (JSON or XML