My take on batting and bowling averages:
Batting Averages:
50+ Legendary class (not every batter with 50 average is a legend but this is a nice even boundary)
45+ World Class
40+ Test Class
35+ Decent
Anything below 30 is too poor for a specialist batsman
Bowling Averages:
25- Legendary class
30- World Class
35- Test Class
Anything above 40 is too poor for a specialist bowler