And, leave legislation without being reviewed by an Upper house?
Your faith in politicians is far too great.
Look at what has been achieved by the Lords even in the last decade can testify to the folly of both getting rid of the reviewing Chamber and of allowing the political parties too great a power in its operations.
Whether you agree with the individual issues the HoL has played an important role in trimming the ambitions of governments over the decades.
42 Day detention being just one example.... there are many more and you can see on this pdf that all governments have suffered defeats.
http://www.google.co.uk/url?sa=t&rct=j&q=government%20defeats%20in%20the%20house%20of%20lords&source=web&cd=17&ved=0CFsQFjAGOAo&url=http%3A%2F%2Fwww.parliament.uk%2Fbriefing-papers%2FSN03252.pdf&ei=-tf6T8HyFsWu8QPfp_SMBw&usg=AFQjCNF25JFPaa-GiLUSN-n0LFRkIQcbjA&cad=rja