Visually the pitch changes quite dramatically, in terms of gameplay it doesn't really change all that much, although fast bowlers are more effective on hard-pitches (and can pull off the shorter ball) as opposed to green-tops where it doesn't bounce as high, but swings a little more. Again, I think its one of those things (again) that comes down to balance and could be looked at to push it a little harder, but not too much. Spinners could turn it a little more on cracked pitches certainly and medium-pace swing bowlers (an unexplored gem, which I think are underrated) could be more effective on soft/green top pitches. ....and so on.
It all comes down to "fun" for me - would it be realistic to see the ball turning 30 - 40 degree's when it hits a crack, maybe... would it be fun? Nope.