It's nostalgia time. ESPN has attempted to rank the best video games of all-time. They landed on Tecmo Super Bowl at #1. Depending on your age and/or console of choice, you may have a different view.
Personally, I was just a bit too young for NBA Jam. I grew up on NBA Hang Time, which was the sequel I believe. After that, the EA NHL franchise has been awesome. Growing up in central Ohio, I didn't follow hockey much, until the CBJ came to town really. It sounds stupid, but I learned a lot from playing the NHL games - rules, strategies, rosters/personnel, etc.
What's your all-time favorite sports video game?