I feel like a pessimist when I say this but I personally think an SUV is the Ultimate Compromise in a vehicle......especially the Porsche Cayenne.
1. Due to it's weight peformance will be lacking.
2. Because of its height handling will be poor.
3. Due to it's off road capability, ride comfort will be compromised.
4. Because they are mainly designed for on road use, off road use is limited.
5. Since it is designed for partial off road larger wheel wells are required hence less interior space and less room for passengers and cargo.
I guess you can look also look at it the other way.....and SUV does a little bit of everything.
I truly think the main attraction towards SUV's are their appearance, forward visibility and the feeling that bigger is better in an accident.