It hasn't aged well like other Mario games have...
I downloaded it because I thought it would be just as fun as it was when it was first released. I was a little right, but also a little wrong. Mario Bros. may be an old-school style arcade hit, but almost 25 years after its release, it doesn't seem to hold up as well. It as not aged well as some people who are fans of the original Mario Bros. You can get this game for $5.00 off of Wii Shop, but it seems kind of like flushing that $5.00 down the toilet. I didn't like this as much as the Donkey Kong game from Wii Shop Channel.
You're better off getting another big arcade game like Space Invaders, Donkey Kong, Pac-Man, and so on. Don't get this game unless you're a big fan of Mario Bros, like I am, or you have it for your NES, 2600, etc., or if you just wanna waste 5 bucks of your life. It's okay, but not so great after 25 years...