Personally I find it to be an amazing port.. The 3d "Dynamic" view gives it a new look, and the gameplay is virtually identical.. I would imagine it plays best on an XL (this is what I am using, and I am having no trouble). Playing in the 'Lite' mode, you can map special moves , and the super/ultra combos to touch screen buttons.. Which to some makes the game too easy. But there is a 'Pro' setting that takes away those hot keys, forcing you to pull off the moves/combos the normal way.
I'd say if your a Street Fighter Fan, and a 3DS owner, this is a must own.. & the price is right too.. At least on Amazon, a brand new copy is less than $20.