They tend to grow on you. I was fortunate enough to be able to go on group trips, where the ticket was more affordable for a college student.
So far, I've seen "Madame Butterfly", "The Mikado", "Porgy and Bess", and "Marriage of Figaro". It's been forever since I've been to the opera, but musicals I tend to see more often, since they're a bit more upbeat and cheaper.