To make tool selection easier, it is best to develop criteria in categories of functionality. This will make it easier to compare the tools in different areas and is more effective than trying to come up with a single number or score to indicate that one product is best. All ETL tools have their strong and weak points. The goal of an evaluation should be to identify those strengths and weaknesses and match them up to what is important to your organization.
It doesn't make much sense to rate products based on features you may never use, so look at the things that are important to you and ignore the rest. Fewer criteria will also help to speed up your evaluation. The remainder of this article discusses the basic categories you might want to use to develop your detailed evaluation criteria.
I will be posting a PDF of a criteria list I used to maintain shortly. Check back here in a week.