Nah. If he had succeeded we would’ve felt really conflicted about how triumphant it would feel.
It’s like the Vikings in How to Train Your Dragon and the Failure there. They “win”, and yet there’s something stranglely bittersweet about the ending. That’s the Failure/Good dynamic at work. Same thing with Michael Clayton. We kinda sorta want Tilda to “win”, even though she’s doing some really heinous things.
Who doesn’t root for Darth in Empire? I mean, not if anyone asked us would we admit to it, but inside we kinda sorta need to cheer him on.
In addition, EVERYONE fails to Be in Empire—dark or light side. There’s a bit of objective success with Leia and Luke escaping, but overall no one comes out ahead.