I live so close to Deagan's and yet only recently made it there. Every other time I've gone, the place has been packed with a wait of over 30 min - and no space at the bar to even cozy up for a beer. Fortunately, a friend and I made it there early during the week (5pm on a Wednesday - only a few tables taken).
Well worth the wait! Every night they have different specials, with Wednesdays being "vegetarian/vegan". While the vegan options were limited, the regular menu has plenty of things for vegetarians (I'm a reformed vegetarian). The vegetarian cheese special had a goat cheese with maple syrup and figs. The waitress highly suggested it, and won applause - it is one of the best appetizers ever. My dining mate and I fought over the last bits and left the plate clean. I can't speak of other servers, but ours was attentive, funny, and had great suggestions. Never once did my water glass go empty.
They have a good beer selection that changes regularly (while I do think that the Winking LIzard has a better selection over all, Deagan's might win for being a bit more interesting). Do try the pommes frites. I thought, "They're fries, for like, $6??" and rolled my eyes. My dining companion looked more serious than ever and ordered them. She was right. They are fantastic. The mac and cheese with duck confit was another winner. We may have scraped that bowl clean. The portions aren't huge, but the small plates are great for sharing and the food is wonderful, especially for bar food.
I had my back to the rest of the room, but by the time we left, it was packed to the brim. Can't wait to come back!