a good answer should ideally look at both sides. it is basically a strengths and weaknesses of parliament question -- it doesnt mean you can't have a contention -- you still can -- and you need to decide on a contention yourself, but you also SHOULD look at both sides.
so, if you wanted to say that it IS too slow, then say something like it's too slow because parliament has to discuss and debate each bill thoroughly and this takes a very long time. BUT on the same token, mention that parliament CAN pass laws quickly when need be and use an example, such as rudd's stimulus package which passed the lower house in one overnight session. then, you could couple it with the fact that passing a law so quickly is a downfall too because it means it hasn't been checked properly enough, meaning that it would have to go through parliament again anyways -- which wastes more time and slows down the law making process.