Nixing plated/buffet dinner and doubling hors d'oeuvres+pizza?

My fiancé and I are trying to cut catering costs, because it's crazy expensive where I live. One of my friends suggested that we double the amount of hors d'oeuvres that we serve and then order a boatload of pizzas, which would definitely cut down how much we spend on food and wait staff. Is this tacky or rude? Would any of you be really upset that you traveled across the country, and that's what was provided? The ceremony would be at 6:00pm, hors d'oeuvres would start at about 6:30pm for 2 hours, followed by a variety of pizzas. I thought it might be kind of cute, like a small plate menagerie, but my mom thinks that it's cheap and in poor taste.