It's fun but not a memorable Super Mario game and it's big focus on coin collecting may or may not be to your liking.
It's gameplay is fun and it's controls are tight as ever,it does feel like I've played this game many times when I've played the other 2D Mario games which isn't a bad thing because they're all fun except the short levels and short story mode make the experience a bit disappointing and the new things the game has to offer revolve around coin collecting.
Graphically this game looks like a visually upgraded version of a Super Mario Bros 3 which isn't a bad thing because I love the artstyle of SMB3 more than the artstyle for any other 2D Super Mario game,however it would have been nice if instead of the typical desert and snow levels the developers could have gone for new types of environments to freshen the game up a bit,perhaps city levels or tropical levels(city environments are in the Mario Kart games and although tropical levels are in the first NSMB game for DS they could have been done a lot better).But I'm glad they kept the typical grassy area with the castle in the background which is part of Super Mario folklore.
The story is the same as usual,Princess is kidnapped but instead of being kidnapped by Bowser directly it's his goons who kidnap her but of course you'll need to rescue her from Bowser.The final boss battle is epic and has a creative design and does a good job of creating story suspense...you'll see why.
The game focuses a lot on coin collecting,you can collect coins in many places and there's powerups which give you coins just for running and the level designs encourage you to risk dying in order to collect coins because there's rewards if you reach 1 million coins but collecting 1 million coins doesn't really appeal to me because I play games to experience story and level progression.If collecting 1 million coins appeals to you then you'll need to make use of the tanooki suit's abilities as well as the ability of the suit that gives you coins for running and it can be quite challenging and would add replay value.Coin rush mode is another mode that lets you collect coins that count to your coin total and you're encouraged to rush through the levels since quicker level completion times means more coins whilst collecting as many coins as you can without dying.
Overall,like I said it's a fun game but due to it's short levels and focus on coin collecting I don't think it's a great game but it's a good game and fun game nonetheless.If you want to play a great and newer 2D Super Mario game I suggest you try New Super Mario Bros U(which has HD visuals and new and enjoyable features that don't revolve around coin collecting).