It's reported that he was incredibly philanthropic, helping to raise tens of millions of dollars and contributing much of his wealth to help others. An iconic gameshow host, but an even better human being.
I don't know much about him. But I like what I did read.
I'm not sure US gameshows were shown on UK TV (not much, anyway), but I know that his style of presenting, and the gameshows he hosted, were influential. I'm sure some of our gameshows, whilst having different names, were influenced by those that Monty Hall presented.