not burning cards in home tourney

[bigcountry]

i have played a few times at a friends house, when they get together and play some NL holdem tourneys. the problem is this, when they play they don't burn cards. the first five cards of the top of the deck are the flop, the turn, and the river. i pointed this out and the man hosting it says that it doesn't matter how u play it. am i right to think that without burning cards it changes the whole game.