Cut rotors have a couple of drawbacks. In both cases you're working with units that are now thinner. One is the ability to shed the same degree of heat - remember rotors don't stop you, pads don't stop you, it's a combination of the friction they generate that does the trick (along with tire grip- of course). Thinner rotors are also much more likely to warp from quick temperature changes such as running through a water puddle that cools them too quickly.
As to Ebay stuff - it's cheap for a reason but don't think for a minute that the Autozone, Advance Auto, O'Reilly's or whatever down the street doesn't source them from the same wholesaler who in turn sourced them from a manufacturer that gave them the best deal. There's some truth in "Tommy Boy". Even Nissan sources it's components from different outfits but you can normally assume that the specifications are going to be tighter, the inspections and QC are going to be better - no manufacturer is going to want to lose a contract with Nissan for supplying junk parts.
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