3.5*
Unicorn is a solid pub, but as it has been mentioned nothing extraordinary! The space is huge, and I'd guess you could have a good time here on the crowded night if the young people of Yonge and Egg went out in their own 'hood more often.
There have been live bands when I've visited (mostly on Thursdays), and the music has consisted of the typical pub cover band.
Food-wise Unicorn is a cut above the average pub grub, and they actually carry a few authentic Irish items. That being said I usually go for wings (1/2 price on Tues) or nachos. The burgers are MASSIVE to the point of falling apart, which isn't necessarily a good thing! There is also a daily 'happy hour' which discounts all appetizers before 7pm or so.
I wasn't too impressed with the beers available, but on the bright side they serve half pints for those times you can't decide if you want another!