Its been my experience banks will cash any check that goes through in a deposit, if you sign it joe public and your name is kwazy ibfume. I hurt my hand once and my signiture looked like a straight line and my checks still were cashed.
Aldaron, there was a time when banks did check the signatures on checks that were coming through deposits. In this day and age that is no longer possible. The bank I work for process over 11 million checks a day in Southern California alone.
A bank will look at the signature on checks in certain instances, one being when presented at a teller and being cashed for a non-customer. The other instance is when there is a dispute, or in the case of fraud.
So you are right, you could probably sign Mickey Mouse on your checks and they will probably pay fine. This is why it is ever so important for customers and businesses to use the tools and resources made available to them. You are your own best defense, and it is your job to tell the bank something is wrong.
take care, tigi