On average, the legislative representative has no clue about the motion but someone along its party said to vote yes or no and that is it...
To be fair, numerically most of the new laws pass in a "alternative" voting style where you have only the leader of a block of parties voting for all the block... And sometimes they even form blocks of laws to the voted in this style... So yes, no discussion at all...
You have to understand also that we follow the Roman Judicial System, so we have a hundred times more laws that the Anglo-Saxonic countries...