I understand what everyone is saying, but... I didn't hate this episode as much as everyone else.
The constant call-and-response of nostalgic moments was a filling meal for me. We've known from the start that whatever plot they cobbled together would need to be largely ignored, and I'm willing to keep doing it because with this season, at least there's another kind of payoff instead of utter disappointment.
They kept acting like it was the Klingon cloaking device they installed, but didn't Riker see the Pegasus cloaking device in an alcove at one point? It was very brief and I wasn't sure exactly what the equipment was, but visually it approximated the device from the older episode...
How they wrote Data back in was pretty bad, though. B-grade fanfic level. But again, there's no extracting enjoyment from this shindig without turning the brain 75% off...