That actually makes the game a lot easier and lowers the number of good tactics. In the way we have it now, you have to find a strategy to get around or through certain cards, like Fire Shield, but if you simply chose not to attack, the severely weakens the Fire Shield card to the point where no one would want to use it, simply because the opponent could choose not to attack until they drew a card that could get rid of it.
As for the creatures being able to attack other creatures, all you need is one high powered creature and your opponent's creatures will all be destroyed basically. In the way the game works now, you have to think carefully, and act more sparingly when trying to destroy your opponents creatures with a limited number of ways to be able to.