Here's a bit from the Destructoid review:

Other 3DS-specific features include some occasional gyroscope controls that are difficult to acclimate to, and the ability to make your own camouflage by taking photographs of real objects with the 3DS camera. Neither feature stuck out as worthwhile to me, especially the camouflage thing, which, if abused, could completely void the value of collecting in-game camo. Probably the least flashy but most worthwhile addition to the game is the crouch walk from Metal Gear Solid 4. It really helps to keep the game flowing toward the player at a brisk pace. CQC has also been streamlined, making hand-to-hand combat much more breezy. That's what people like about stabbing guys in the neck, right? The "breezy factor"?

There are a few other little nods to Nintendo in the game, like Yoshi dolls that are hidden in nearly every stage, and the occasional issue of Nintendo Power lying around in Snake Eater 3D's more upscale locations. These touches are cute, but they don't quite offset the amount of content that didn't make the jump from the PS2 original to this handheld port.

Check out the source link for the full review.

Source: Destructoid