I have been to Barcelona on 2 weekend evenings with a large birthday group and another time with another couple. It has become an "it" place to be seen with the beautiful people of Atlanta. There can be waits even with reservations. The atmosphere is fun for groups, which there always seem to be a lot of, but don't think I'd go for a quiet romantic / special occasion. It is not cheap...last visit our group of 4 spent about $180 (before tip) and were pretty lite on alcohol. We had 2 servers that were good but seemed a bit taxed with traffic on a Saturday night.
The food is a true tapas experience with a good variety of Spanish influenced small dishes. I echo the enthusiasm for the hanger steak w/truffle sauce (I ordered a 2nd plate of it). Everything we had with pork, seafood, or cheese was good. There is also a nice selection of wines by the glass. If you are not accustomed to tapas it may be a bit of adjustment to variety of small plates versus big entrees but this is the heart of the experience.
I reserve the right to update after upcoming trip to Spain!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.