Reduced to be more on topic...these I'd probably say did change my life as far as gaming was concerned...theres probably a couple more that will have changed my attitude to gaming, but these are the main ones...

Mario 1 - got me into games full time after dabbling with older stuff as a toddler...

Street Fighter 2 - was the first real game to hook me on multiplayers...

Final Fantasy VII - first FF game I played and is the main thing that got me back into 1 player gaming...the story elements etc meant it was the first game I played which was more than just a game...