You will know it is a good deal IF:
The payments are comfortable for you
You are raising your family in a great house
You can look back and say it was better than throwing your money away on rent
Everyone is happy
On the other hand, if you are an investor, it is a good deal if you can flip it and make money, or you are in it for the long run and can rent it and break even and wait to see where the market goes.
Everyone's version of a good deal is different. What is your opinion? What do you want? What were your goals when you bought, sold, rented? What were the tax ramifications?
This is not a 'one size fits all' question, so more details would be needed before a good answer could be given.