Haha, just bought it tonight.
I'm at the stage where I just press buttons, but try not to button-mash *too* much. It hasn't been too difficult so far, but I heard that some of the missions further in the game are harder than they should be. Luckily, I'm not there yet. x)
SPOILERS...?
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So far I've only unlocked Neji, and I just unlocked Hinata's Story Mode.
Out the the characters I've used (which only consist of Shikamaru, Lee, and Neji, I'm going to have to say Neji's my favourite at the moment (though his 3rd Ougi is annoying after you do it enough times. "64 PALMS!" *cringes*)