On the one hand, Legends is in my opinion the best campustown/Green Street bar. On the other hand, it's still a college bar. But it's my favorite and thus 5 stars.
Great atmosphere, never overly crowded the way some of the other dumps on campus are, often you're able to grab a seat, even on some of the busiest nights. My favorite night was Tuesday nights - Ride the Rail, and yes I completed my rail card senior year. I've got my name up on the wall which is very cool but I've got so many great memories of sitting around having beers with friends. And, I have to say, the beer selection's pretty good actually. They always have a few good drafts on top of the normal college bar cheap, watered down stuff. Nothing elaborate, but good quality mass produced stuff - Sam Adams Seasonals, Woodchuck, etc.
The food's surprisingly good as well. I would say Firehaus has better food, but as far as green street bars go, that's probably it. I generally stuck with burgers or chicken sandwiches and they have a good selection of toppings to put on whatever food you get.
But you really go to Legends for the atmosphere. It's an upperclassman bar where you can go to actually hang out and talk with friends. They have good music playing in the background but it's never all that loud and it's stuff you want to listen to anyway. They've got some slot machines and pool tables now which also make for a good time and there's a dressed model of the Chief up front which is a welcome sight for any Illini.