In 1991 a guy I worked with at a local fast food restaurant decided he was selling his NES to buy a Genesis. That's when I got my NES. From 1985 I had been a C64 user, and enough of my friends had NES units that I never really felt the need for one. However in 1991 I was a senior in high school and figured when I moved out I would want a system of my own.
When I went over to the guy's house he had already bought his Genesis. He and another guy were playing Sonic. Although it looked beautiful, it moved way too fast for me. My favorite NES game was SMB3, and I liked the idea of having to search for items in bricks and solving puzzles and jumping more than just running through a level at light speed. It's sad that one game turned me off of a whole system, but I was happy with my C64 (and thousands of free games) and my NES with SMB1 and 3, so I passed on the Genesis.
Last year when I started putting together my home arcade, I put out the word that I'd like to have a Genesis. A friend of mine informed me that the one from his youth was still in his parent's garage, and donated it to the cause. Shortly afterward, I won an auction on eBay of about 30 Genesis games.
Since then I've played the system off and on. Honestly, I probably have less than 20 hours invested total into playing, but I'm getting there. I can see what all the excitement was about, as all the games I've tried (except Where's Waldo) have been fun, with great graphics and sound.