Reading the other reviews here, it seems like some people expected a first or third person shooter. That is certainly not the case! Ghost Recon is a turn-based shooter and a very good one at that. Being a big fan of advance wars and age of empires on the original DS, I was glad to see something similar as a launch title. The turn-based nature of the game is well suited to the pick up and play nature of the 3DS, and if you turn up the movement speed in the options, you won't get frustrated waiting for the enemy to make their move.
The game's story is extremely typical Commando fare, with cliched characters, unlikely to elicit an emotional reaction at any point in the game. In all honesty, I certainly didn't expect anything more, and I'm glad the game accepts some people just want to play the game. The characters themselves can all be upgraded with new weapons and armour, something you will enjoy a great deal. Each squad member is unique enough to be useful in different situations and some missions require that you select a smaller squad, which will require some consideration to hand pick the best team.
The levels are well designed, occasionally funnelling you through tough corridors, at other times allowing multiple routes. The graphics aren't fantastic, but make good use of visual cues, and I never found myself wishing for more. It really depends how you feel about graphics, but don't expect to be blown away.
The game shines when it all comes together. You can have your sniper on a high flank picking off targets, your stealthy character sneaking around killing enemies with a knife and your heavy weapons guy soaking up the bullets. The more time you take to learn the squad's nuances the more fun the game becomes.
Beyond the average 3D that adds little to the overall experience, there is plenty of depth to this game. A lengthy campaign with additional side missions as well and one-console multiplayer won't have you playing until next year, but the game is far from short and well worth the price.
If you are unsure, I'd urge you take the risk, as I didn't expect to enjoy the game as much as I did!