Bughouse lets you have experts and novices playing without the novices getting totally stomped. Because you can always move a piece, or place a piece that your team-mate captured, you have a lot more options. This also makes it far more fun for lesser skilled players than regular chess.
But the people who are good at Bughouse here have all said you have to move in 0.5 seconds or it's not even worth playing. I can play chess quickly, but not that quickly.