We were at Sci-Fi last month for lunch and the service was out of this world (sorry, had to say it). The food was pretty good. The best items were the drinks, DH had an amazing strawberry milkshake and I had a cherry Coke made with real cherries and cherry syrup. The rest of the food was good but no more ... about what you'd get at Chili's. DH had the mango tofu and was really impressed, I had the shrimp pasta and it was fine but nothing special. In any case the waitress was the standout, she was excellent, joking with all her tables and offering to take pictures (they came out pretty good, too).
All that said, it was a wonderful experience we're really glad we did, and we'd eat there again if we were with someone else who wanted to or if we needed a meal in the Studios, but I don't know that we'd go out of our way for it like we did this time (we split our Studios day to have the Fantasmic package one evening, then do a morning at Studios ending with Sci-Fi).
ETA: our reservation was for 12:00 noon, we arrived at 11:50 and were seated by 11:55.