Sora Brentwood, the new hand-roll-focused sushi restaurant, has been packed since the day it opened. We made a reservation before heading over on a Saturday night with our two daughters and a friend who met us there, and it’s a good thing we did. Every table was full and the room stayed loud and busy the entire time. After working our way through about sixteen hand rolls across eight different flavors between the four of us, I walked away with mixed feelings: the food is excellent, but the experience comes with real trade-offs worth knowing before you go. The Concept:…