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Easy boys...
I have heard of cross drilled rotors cracking, but like My240 said, it isn't going to happen unless you are REALLY riding on the brakes.
Old 13 I'm with you most of the way. Cast with the holes in them is better than drilling the holes after the fact, but it isn't like they instantly turn to crap. If they're drilled right it isn't all that bad.
Repeated moderate braking for a long time (like on a track) generates alot of heat so cross drilled (or pre cast holes) do help. The only way you're going to crack a rotor is by stomping in the brake. And a quality brembo rotor is going to be less likely to crack than a cheaper rotor.
Also, shouldn't it be:
bigger rotors = more surface area = better braking
The mass doesn't really slow you down faster, its more the surface area, and pressure applied.
Slotted and/or cross drilled rotors do help braking performance if done correctly. They do slightly reduce the structural integrity, but its a trade off, just like anything else.
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