I've been to the Angus Barn a number of times over the past 10 years. Some of the visits have been exceptional other just average. Let me break it down:
Service: I have never experienced anything but great service at the Angus Barn. We've celebrated a number of birthdays and our kids have always been allowed to visit the kitchen to decorate the cake. The kids love (skittles/gummy bear covered cake is another story). We had a Mother's Day reservation for 20 several years ago. When we showed up we were told that they were overbooked. Instead of having us wait, they provide a private room in the Wine Cellar for our party and treated us very well.
There's a lot to look at within the restaurant, but it is very loud in the main dining room. You're not going to have a romantic evening in the main room. For couples, I'd try to get a table in the Kitchen which is cool or eat up in the Turkey Bar. Bartender's are great and it's much quiter.
Here's where I have a bit of a problem. On one hand, I like the fact that you get a vegetable and starch with your meat selection. On the other, I've had better steaks at other restaurants in Raleigh (Sullivan's, for instance). I've never had a drop-dead, great steak at the Angus Barn.
In summary, the Angus Barn is a fun place to go with a group. The service is great, Prices are high and the food is okay (not spectacular). If a great steak is your focus, try Sullivans.