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Ford has proven the reliability of the V6 under racing conditions already. They have won several races, including the 24 Hours of Daytona with it already.
The boost level is immaterial when the engine is built to it. If they built the 5.2 with a combo for 20psi the conversation would be how silly the lame 8psi version is.
Dimensional the V6 is shorter in both height and length and narrower, add in the dry sump and the height difference is even more dramatic. There is also the matter of 100+ lbs extra that the supercharged V8 weighs. Keep in mind that these factors mean way more to the physics of a sub 3k lbs pure sports car than they do in a nearly 4k lbs, 4 seater pony car.
As far as an engine not being impressive because you can make more power with something else, that is a conversation that will go on forever. If you have the check book for it you can make a phone call and buy 1000hp SBC's and thats without even having the benefit of overhead cams. There is always a way to make more power. However that does not always translate into production cars, be it packaging, reliability, cost, or some other factor.
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