Yu Suzuki's Space Harrier is quite the fun time. It may not be the perfect arcade port and runs a bit slow when you're playing, but, overall, it's a fun game. And, seriously, for $5, it's a great diversion. You aren't going to be investing 20 hours into the thing, but, for $5, it's a great way to waste a rainy afternoon.
Each week, we here at Wii Fanboy like to check out the latest Virtual Console releases in our VC Monday Madness feature, in the hopes that you can make the most sound decision possible regarding purchasing retro titles from the Wii Shop Channel. If you're looking for more retro goodness, check out Virtually Overlooked, which talks about games that should be on the Virtual Console.