[sammyg2]

Which enterprize? the very first one, XCV-330 was sup-warp IIRC, and prolly didn't have photon torpedos.
The first NC-1701 was the one that capt kirk had, it would get it's butt kicked by a star destroyer even if the destroyer's tie fighters didn't get into the frey.
The destroyer is about a gazillion times larger with hundreds of times as many guns. the enterprise only had one phasor and a few torpedos.
Same with the rest of the series of NC-1701s, until we get to NC-1701-J. That was a bad boy. It MIGHT stand a chance against a destroyer but I doubt it.

One thing that always pissed me off about the enterprises, was the fact that it took so darned long to fire. They'd screw around for minutes until the bad guys hit em a couple of times and their shields were starting to fail before they finally got a shot or two off. Haven't they ever heard about a quick draw?