I'd give it a 6.84.
When we were childless, my wife and I would go there two or three times per trip. We'd spend a little time playing the retro games (Akranoid, etc), a little time on the build your own coaster, and a little time on the POTC game. That game is the coolest! Every time we play it, we come out with our hearts racing and sweaty, but we always hit the highest score level with just the two of us.
We always had Premium APs back then, so it was fun to drop it for an hour or two between parks. Now that we have DD3, we don't make the trip as often, because it's usually nap time instead, lol. But we'll keep going every now and then.
If you have Premium APs or & More tickets that include admission to DQ, I would definitely not miss it - it is worth checking out at least once.