I had quite a lot of fun with this but harder AIs and more game modes would be good.

User Rating: 7.5 | Mario Tennis Open 3DS
The good things about Mario Tennis Open is that there are 4 unlock able characters and a fun customization system for your Mii. There are also 8 tournaments but only the final 4 have a decent difficulty level. The 4 "Special Games" will keep you occupied for a small amount of time but probably only because you unlock 1 character from each of them. You also get coins from each of the "Special Games". The character customization system didn't really convince me to keep collecting coins but it is still fun to collect gear for your dream suit. You can also play either singles or doubles matches against AIs with 5 difficulty levels. The last 2 difficulty levels, which are Pro and Ace, are unlocked by completing the World Open and the Star Open. The online multiplayer is probably where I had the most fun here. Though, I sometimes struggled to find opponents. I can't really tell you about streetpass because I haven't found anybody that has this game. Though I've heard that you can exchange Miis to play with on "Ring Shot", which is one of the minigames, and do a streetpass match, which is exactly the same as exhibition, but against a Mii. I had a lot of fun with this game, but there are a few letdowns, including the uninclusion of "Power Shots", that stop this game from being a star. I'm giving it a 7.5 out of 10.