It takes a little time and practice but I hit every shot better now with gut/poly. I can hit far more aggressively and flatten out shots as well..this is using a pure drive roddick. I string higher though..mid 50s. I think 50 is too low initially. I would rather have the stringbed settle in there.
I also would not just go out and play a match with gut/poly. You need to spend a week or so getting used to it, but you can hit every shot in the book with it..defensive..flat..it doesn't matter. Far more versatile to me and I actually have become a lot better at net as well.