Mario Super Sluggers is everything you'd expect it would be. The game is a no-brainer in terms of entertainment value for the whole family and it's definitely a title to pick up if you're looking for some relaxed game time with the kids (or parents). It's very easy to get into and offers plenty of nuances that help flesh out the controls such as "error items" and star abilities. Nintendo's mark of quality holds up well to scrutiny and Super Sluggers stands solidly on its own two feet.
Unfortunately the game is not an improvement over Superstar Baseball and all around there is very little that is "new". As long as that doesn't bother you, you don't mind the lack of online play, and are just looking for a fun game to spend some time with you'll have a good time. Consider the game recommended.