Landlord repairs that do not happen

we have been renting for a little over two years, when we first moved in the house the landlord had renovated the home.  At this time he was aware that the roof and the foundation was needed to be repaired.  Within this time we have cracking tile, cracks on the walls, and cracks between the two wall joints.  Also water marks in the garage and the front entry way.  The landlord has been made aware of the situation just about everytime he comes to pick up the rent.  With the same answer, give him time.  The landlord and my husband had a few argumentive words, my husband stating if something was to happen to our property that he would be liable.  Landlord response is that he would not be liable.  My questions are, would he be liable?  And are these situations problems that can be dangerous?  I do not know what else to do, just does not seem fair that we pay him decent rent, and on time.  Never given him any problems, and yet he is the type of landlord we do not see until rent time.   If there are water marks on the ceilings could there be possibly mold damgage?  What are my rights?  Any advice would be greatly appreciative..