I've been to countless shows at the Marquee over the years. I love the variety of entertainment you'll find here! Most recently I've seen Ellie Goulding, Animal Collective, and SBTRKT. As a kid I have a vivid memory of going to a Russian cat circus at the Marquee (yes, Russian cats doing tricks).
Overall the venue is nice - tons of space for crowds and/or dancing, good sound system, large stage, ok bathrooms, and a bar. I'm not a smoker so I can't give you a report on the patio.
Vodka and cranberry is $6, beer on tap is $7.