Does the US really need a comprehensive reform of it's immigration policy?

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Everyone seems to be running around saying that the US immigration system is "broken" and needs comprehensive reform. But, does it really? Our current immigration policy allows foreign tourists to come visit our country. It allows students from other countries to come to the US to study in our schools and universities. It allows people to apply to come to the US to join other family members who are residents. It allows foreigners to apply for citizenship in our country. It allows companies to sponsor foreign workers so they can fill different postitions at those companies. It allows people who are in danger or are being persecuted in their homeland to apply for refugee status here in the US. The broken aspects of the immigration system seem to revolve around people who came to the US illegally OR stayed past the legal length of their visas and the problems surrounding them. It revolves around the problems caused by these people - housing shortages, low wages, unemployment, crime, etc. The people who are seeking "immigration reform" seem to want to accomplish 2 things - a) amnesty for people who are in the US illegally and b) ways to import more "cheap labor" so that companies can exploit foreign workers and not pay them a fair wage. It appears to me that the problems with our current immigration policy are not found in the policy itself; but, in the enforcement of the policy. The current policy allows plenty of legal opportunities for people to come to the US. The problems are controlling who crosses our borders, ensuring that people leave when their visas and work permits expire, and removing people who are now in the US illegally. These are all enforcement issues. What do you think? Does our immigration policy need "comprhensive reform? Or, do we just need to enforce the immigration policy we already have?