We are not sure if it is still wise to pursue this deal with the overwhelming defects & issues.

They are highly mechanical and any defect can cause issues in opening or closing. 

Are there any material defects that could affect the value of your home that you are aware of?

All properties will have to be transferred to a single entity so as to prevent any defects or encumbrances on title.But, my two cents would be to have a conversation with a trusted lender.

Pretty common defect I see.

As well, a quitclaim deed does not guarantee that a property is free from title defects such as tax liens or title claims from third parties

I bought a house "as-is" but isn't the buyer still required to disclose known defects, and if they don't, can I sue? 

My wife takes lots of pics of defects and issues.

Based on the fact you have presented in this email chain, I would expect the buyer to argue that by not checking the appropriate box on your disclosure form, you misled him/her into believing that no potential environmental defect in title existed. 

Pointing out what is broken/defective and then informing the seller of the price to repair it is what usually happens to get a price reduction or seller credit2.