Any hair treatment should be include a conditioner. The tangles are only helped if the products states it. These shampoos are for quick fixes, and when time is limited. You can never over condition your hair.
There are some very good 2-in-1 shampoos on the market that work without extra conditioner. One of the best is TRESemme. Another great brand is Aramis Protein-Enriched shampoo. The shampoo cleans the hair and conditions without extra conditioners to dull hair.