I am sure you can contact them for a free 7 day trial. You can open an account with them, then mine as normal except you will not get your daily payouts, but you should be able to still see what you would have got on the interface. At the end of the 7 days, they will pay you the coins you have mined if you pay for the contract you wanted to have. This way, you can decide for yourself if you want to go ahead with it or not and you have your own opinion and not anyone elses.
They have a message thread here.
https://bitcointalksearch.org/topic/genesis-miningcom-worlds-leading-hashpower-provider-602022
You can PM them here and ask them about the trial and if it is possible to do. I have seen articles where people have been able to do a trial, but I think you have to ask them.
In the PM, tell them that I mentioned it to you, just so that if I am wrong, they can come and tell me off
A free trial sounds a great idea for any one apprehensive about Genesis Mining.