1> Dont know the number, but worse than a 109, especially as you cant trim out of it.
2> Acceleration is horrible. Once you lose energy on this thing, good luck getting it back in a hurry.
3> Unarmoured vehicles, sure. Open topped AA vehicles can be disabled at least. Heavy armour vehicles (IE Tanks) can only be disabled on a VERY good day.
The G2 makes a somewhat decent BnZer if you keep it fast. Weight helps it retain energy, though once it's gone it's gone.
Can do fairly well slow against something that isn't a dedicated turn-fighter. Biggest disadvantage is the large size makes it an easy target, and it has a fragile tail.
EDIT: Yeah, and dont stall the thing, ever. Any stall seems to become a snaproll, which seems to become a very flat spin.