The Second City is a nice cozy theater. It's hard to find a bad seat, and the ticket prices are reasonable. I can't tell you that every show is going to be laugh out loud pee-your-pants hilarious, but I have enjoyed the shows I've seen there.
Service is good and drinks are strong and fairly priced.
Tip! Look on the website for the student shows on weekend afternoons. Those shows are free and really fun. FREE IMPROV.