Straphangers researchers found both lines to be crowded and prone to delays. While riders pay a base fare of $2.25 to ride the lines, the advocacy group rated their value at 90 cents.
Despite those poor performances, the system as a whole didn't fare too badly in this year's report.
Straphangers said the best of New York's twenty subway lines was the J/Z, which runs from Broad Street in Manhattan to to Jamaica, Queens. The J/Z scored above average in trains arriving at regular intervals, seats available during rush hour and miles between breakdowns.
Subway trains in general were more robust in 2010. They broke down an average of every 270,000 miles--a fifteen percent improvement over 2009. Cleanliness and the quality of car announcements remained high at 95 percent and 87 percent of all trains.
To take one example of best vs. worst from the report, riders on the 6 line could expect a train every two and a half minutes during rush hour; riders on the C waited 9 to 10 minutes throughout the day.
If you're a New Yorker, go here to see how your subway line fared in the report.
Listen to the conversation about the report on the Brian Lehrer Show: