Calculate your Return on Investment to evaluate the profitability of any investment.
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ROI = (Returned - Invested) / Invested x 100. The annualized figure compounds the total return back down to a per-year rate so multi-year investments can be compared fairly.
It depends on risk and time. The broad stock market averages roughly 7-10% per year long term, savings accounts pay whatever the current rate is, and anything promising far more should make you ask what the risk is.
A 50% return over 5 years is not as impressive as it sounds — it is about 8.5% per year. Annualizing puts investments of different lengths on the same footing.