what counts as a good cagr will depend on the context but generally speaking investors will evaluate this by thinking about their opportunity cost as well as the riskiness of the investment for example if a company grew by 25 in an industry with an average cagr closer to 30 then its results might seem lackluster by comparison but if the industry wide growth rates were lower such as 10 or 15 then its cagr might be very impressive 
in general a higher cagr is better 