I don't know much about this controversy but a quick read of Wikipedia provided this,
"
More than two dozen reconstructions, using various statistical methods and combinations of proxy records, have supported the broad consensus shown in the original 1998 hockey-stick graph, with variations in how flat the pre-20th century "shaft" appears.
[12][17] The 2007
IPCC Fourth Assessment Report cited 14 reconstructions, 10 of which covered 1,000 years or longer, to support its strengthened conclusion that it was likely that Northern Hemisphere temperatures during the 20th century were the highest in at least the past 1,300 years.
[18] Over a dozen
subsequent reconstructions, including
Mann et al. 2008 and
PAGES 2k Consortium 2013, have supported these general conclusions"
Perhaps this is out of date, do you have a link for more up to date work? One of the great things about the scientific method is your position can evolve as more and better information becomes available.