In case it isn't changed next year (I personally didn't like the MVP mechanism but that's just me), check out this post over at the show nation. Here's the first paragraph and possibly the solution to your (and many others) problem:
The key to hitting in MLB The Show 12 is timing. Now of course you probably already suspected this, but the real question is how do you distinguish between a fastball and an offspeed pitch? To recognize the speed of a given pitch you must discern the pitch’s rate of optical expansion as it leaves the pitcher’s hand; pitches that travel at greater speeds increase in their apparent size (expand optically) sooner after leaving the pitcher hand than pitches that travel at lower speeds. Let me reiterate this point from a different perspective: BOTH fastballs and off-speed pitches increase in their apparent size after being released from a pitcher’s hand and have the same net magnitude of increase in size, the difference between the two pitches is a TEMPORAL DIFFERENCE, NOT A VISUAL DIFFERENCE. Fastballs increase in their apparent size in LESS TIME compared to off-speed pitches which take MORE TIME to increase in apparent size. This means that in order to distinguish between fastballs and off-speed pitches you need to be consciously aware of how much time has elapsed after the pitcher’s release, and you use this awareness of elapsed time and compare it to the baseball’s size on the screen. If the ball is large compared to its size at release and little time has elapsed you need to start your swing earlier, but if after the same period of time has elapsed the ball appears to not have increased in size quite that much then you should automatically know to wait a bit longer before beginning your swing.
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